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When a planet crosses directly between us and its star, we see the star dim slightly because the planet is blocking out a portion of the light. We can make a plot called a light curve with the brightness of the star versus time. Using this plot, we can see what percentage of the star's light the planet blocks and how long it takes the planet to cross the disk of the star. Larger planets block out more light. ", "items": [ { "id": 306299, "type": "media", "extra_data": null, "title": null, "caption": null, "instance": { "id": 460363, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011400/a011428/Exoplanet_Animation_Transit_Light_Curve_youtube_hq_print.jpg", "filename": "Exoplanet_Animation_Transit_Light_Curve_youtube_hq_print.jpg", "media_type": "Image", "alt_text": "Exoplanet Animation - Transit Light CurveWhen a planet crosses directly between us and its star, we see the star dim slightly because the planet is blocking out a portion of the light. 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The molecules in a planet's atmosphere absorb certain wavelengths of a star's transmitted light. We can see this absorption as the planet transits the star's disk, and we can thus identify the molecules in the planet's atmosphere.
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Studying these differences in transit depths can reveal information about the composition, size, and density of the transiting planet's atmosphere.", "width": 1280, "height": 720, "pixels": 921600 } }, { "id": 306333, "type": "media", "extra_data": null, "title": null, "caption": null, "instance": { "id": 460398, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011400/a011428/Exoplanet_Animation_Transit_Depth_vs_Wavelength_720x480.wmv", "filename": "Exoplanet_Animation_Transit_Depth_vs_Wavelength_720x480.wmv", "media_type": "Movie", "alt_text": "Exoplanet Animation - Transit Depth vs WavelengthAn individiual planetary transit can appear different when observing the star at different wavelengths. That's because a planet's atmosphere blocks out more light at some wavelengths and less light at other wavelengths. Studying these differences in transit depths can reveal information about the composition, size, and density of the transiting planet's atmosphere.", "width": 720, "height": 480, "pixels": 345600 } }, { "id": 306334, "type": "media", "extra_data": null, "title": null, "caption": null, "instance": { "id": 460399, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011400/a011428/Exoplanet_Animation_Transit_Depth_vs_Wavelength_nasaportal.mov", "filename": "Exoplanet_Animation_Transit_Depth_vs_Wavelength_nasaportal.mov", "media_type": "Movie", "alt_text": "Exoplanet Animation - Transit Depth vs WavelengthAn individiual planetary transit can appear different when observing the star at different wavelengths. That's because a planet's atmosphere blocks out more light at some wavelengths and less light at other wavelengths. Studying these differences in transit depths can reveal information about the composition, size, and density of the transiting planet's atmosphere.", "width": 640, "height": 360, "pixels": 230400 } }, { "id": 306335, "type": "media", "extra_data": null, "title": null, "caption": null, "instance": { "id": 460400, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011400/a011428/Exoplanet_Animation_Transit_Depth_vs_Wavelength_ipod_lg.m4v", "filename": "Exoplanet_Animation_Transit_Depth_vs_Wavelength_ipod_lg.m4v", "media_type": "Movie", "alt_text": "Exoplanet Animation - Transit Depth vs WavelengthAn individiual planetary transit can appear different when observing the star at different wavelengths. That's because a planet's atmosphere blocks out more light at some wavelengths and less light at other wavelengths. Studying these differences in transit depths can reveal information about the composition, size, and density of the transiting planet's atmosphere.", "width": 640, "height": 360, "pixels": 230400 } }, { "id": 306345, "type": "media", "extra_data": null, "title": null, "caption": null, "instance": { "id": 460410, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011400/a011428/Exoplanet_Animation_Transit_Depth_vs_Wavelength_720x480.webm", "filename": "Exoplanet_Animation_Transit_Depth_vs_Wavelength_720x480.webm", "media_type": "Movie", "alt_text": "Exoplanet Animation - Transit Depth vs WavelengthAn individiual planetary transit can appear different when observing the star at different wavelengths. That's because a planet's atmosphere blocks out more light at some wavelengths and less light at other wavelengths. Studying these differences in transit depths can reveal information about the composition, size, and density of the transiting planet's atmosphere.", "width": 720, "height": 480, "pixels": 345600 } }, { "id": 306337, "type": "media", "extra_data": null, "title": null, "caption": null, "instance": { "id": 460402, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011400/a011428/Exoplanet_Animation_Transit_Depth_vs_Wavelength_ipod_sm.mp4", "filename": "Exoplanet_Animation_Transit_Depth_vs_Wavelength_ipod_sm.mp4", "media_type": "Movie", "alt_text": "Exoplanet Animation - Transit Depth vs WavelengthAn individiual planetary transit can appear different when observing the star at different wavelengths. That's because a planet's atmosphere blocks out more light at some wavelengths and less light at other wavelengths. Studying these differences in transit depths can reveal information about the composition, size, and density of the transiting planet's atmosphere.", "width": 320, "height": 240, "pixels": 76800 } }, { "id": 306339, "type": "media", "extra_data": null, "title": null, "caption": null, "instance": { "id": 460404, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011400/a011428/Exoplanet_Animation_Transit_Depth_vs_Wavelength_prores.mov", "filename": "Exoplanet_Animation_Transit_Depth_vs_Wavelength_prores.mov", "media_type": "Movie", "alt_text": "Exoplanet Animation - Transit Depth vs WavelengthAn individiual planetary transit can appear different when observing the star at different wavelengths. That's because a planet's atmosphere blocks out more light at some wavelengths and less light at other wavelengths. Studying these differences in transit depths can reveal information about the composition, size, and density of the transiting planet's atmosphere.", "width": 1280, "height": 720, "pixels": 921600 } } ], "extra_data": {} }, { "id": 345119, "url": "https://svs.gsfc.nasa.gov/11428/#media_group_345119", "widget": "Single image", "title": "", "caption": "", "description": "Exoplanet Image - Crescent Transit
This planet is about to cross in front of its star.
Credit: ESA/Hubble", "items": [ { "id": 306347, "type": "media", "extra_data": null, "title": null, "caption": null, "instance": { "id": 460412, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011400/a011428/Crescent_Transit.png", "filename": "Crescent_Transit.png", "media_type": "Image", "alt_text": "Exoplanet Image - Crescent TransitThis planet is about to cross in front of its star. Credit: ESA/Hubble", "width": 1280, "height": 720, "pixels": 921600 } } ], "extra_data": {} }, { "id": 345120, "url": "https://svs.gsfc.nasa.gov/11428/#media_group_345120", "widget": "Single image", "title": "", "caption": "", "description": "Exoplanet Image - Limb
An exoplanet's atmosphere can filter out certain wavelengths of its star's light.", "items": [ { "id": 306348, "type": "media", "extra_data": null, "title": null, "caption": null, "instance": { "id": 460413, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011400/a011428/Exoplanet_Limb_2.png", "filename": "Exoplanet_Limb_2.png", "media_type": "Image", "alt_text": "Exoplanet Image - LimbAn exoplanet's atmosphere can filter out certain wavelengths of its star's light.", "width": 1280, "height": 720, "pixels": 921600 } } ], "extra_data": {} }, { "id": 345121, "url": "https://svs.gsfc.nasa.gov/11428/#media_group_345121", "widget": "Single image", "title": "", "caption": "", "description": "Exoplanet Image - Atmospheric Depth
Transit methods can help us determine the depth of an exoplanet's atmosphere as it passes in front of its star.", "items": [ { "id": 306349, "type": "media", "extra_data": null, "title": null, "caption": null, "instance": { "id": 460414, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011400/a011428/Atmospheric_Depth.png", "filename": "Atmospheric_Depth.png", "media_type": "Image", "alt_text": "Exoplanet Image - Atmospheric DepthTransit methods can help us determine the depth of an exoplanet's atmosphere as it passes in front of its star.", "width": 1280, "height": 720, "pixels": 921600 } } ], "extra_data": {} }, { "id": 345122, "url": "https://svs.gsfc.nasa.gov/11428/#media_group_345122", "widget": "Single image", "title": "", "caption": "", "description": "Exoplanet Image - WASP-19b Transit Depth Curve and Moleclues
Exoplanet WASP-19b is a \"hot Jupiter\", a gas giant that orbits close to its star. Analyzing its transit across different wavelengths shows varying transit depths. This variation indicates high abundance of hydrocarbons like methane and hydrogen cyanide in the planet's thick atmosphere, and low abundance of water - probably not your next vacation destination! ", "items": [ { "id": 306350, "type": "media", "extra_data": null, "title": null, "caption": null, "instance": { "id": 460415, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011400/a011428/WASP_19b_all.png", "filename": "WASP_19b_all.png", "media_type": "Image", "alt_text": "Exoplanet Image - WASP-19b Transit Depth Curve and MolecluesExoplanet WASP-19b is a \"hot Jupiter\", a gas giant that orbits close to its star. Analyzing its transit across different wavelengths shows varying transit depths. This variation indicates high abundance of hydrocarbons like methane and hydrogen cyanide in the planet's thick atmosphere, and low abundance of water - probably not your next vacation destination! ", "width": 1280, "height": 720, "pixels": 921600 } } ], "extra_data": {} }, { "id": 345123, "url": "https://svs.gsfc.nasa.gov/11428/#media_group_345123", "widget": "Single image", "title": "", "caption": "", "description": "Exoplanet Image - WASP-19b Transit Depth Curve
Exoplanet WASP-19b is a \"hot Jupiter\", a gas giant that orbits close to its star. Analyzing its transit across different wavelengths shows varying transit depths. This variation indicates high abundance of hydrocarbons like methane and hydrogen cyanide in the planet's thick atmosphere, and low abundance of water - probably not your next vacation destination! ", "items": [ { "id": 306351, "type": "media", "extra_data": null, "title": null, "caption": null, "instance": { "id": 460416, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011400/a011428/WASP_19b_Curve.png", "filename": "WASP_19b_Curve.png", "media_type": "Image", "alt_text": "Exoplanet Image - WASP-19b Transit Depth CurveExoplanet WASP-19b is a \"hot Jupiter\", a gas giant that orbits close to its star. Analyzing its transit across different wavelengths shows varying transit depths. This variation indicates high abundance of hydrocarbons like methane and hydrogen cyanide in the planet's thick atmosphere, and low abundance of water - probably not your next vacation destination! ", "width": 1280, "height": 720, "pixels": 921600 } } ], "extra_data": {} }, { "id": 345124, "url": "https://svs.gsfc.nasa.gov/11428/#media_group_345124", "widget": "Basic text", "title": "For More Information", "caption": "", "description": "See [http://www.nasa.gov/content/goddard/hubble-traces-subtle-signals-of-water-on-hazy-worlds/](http://www.nasa.gov/content/goddard/hubble-traces-subtle-signals-of-water-on-hazy-worlds/)", "items": [], "extra_data": {} } ], "studio": "gms", "funding_sources": [ "ESE" ], "credits": [ { "role": "Animator", "people": [ { "name": "Dan Gallagher", "employer": "USRA" }, { "name": "Michael Lentz", "employer": "USRA" }, { "name": "Chris Smith", "employer": "HTSI" }, { "name": "Scott Wiessinger", "employer": "USRA" } ] }, { "role": "Video editor", "people": [ { "name": "Dan Gallagher", "employer": "USRA" } ] }, { "role": "Producer", "people": [ { "name": "Dan Gallagher", "employer": "USRA" } ] }, { "role": "Scientist", "people": [ { "name": "Avi Mandell", "employer": "NASA/GSFC" } ] }, { "role": "Project support", "people": [ { "name": "Aaron E. Lepsch", "employer": "ADNET Systems, Inc." } ] }, { "role": "Writer", "people": [ { "name": "Elizabeth Zubritsky", "employer": "ADNET Systems, Inc." }, { "name": "Avi Mandell", "employer": "NASA/GSFC" }, { "name": "Dan Gallagher", "employer": "USRA" } ] } ], "missions": [], "series": [ "Narrated Movies" ], "tapes": [ "Exoplanet Atmospheres (Produced by: Dan Jacob)" ], "papers": [], "datasets": [], "nasa_science_categories": [ "Planets & Moons", "Universe" ], "keywords": [ "Atmosphere", "Earth Science", "Exoplanet", "extrasolar planet", "HDTV", "Hot Jupiter", "Hyperwall", "Radial velocity", "Spectroscopy", "Transit", "Waterworld" ], "recommended_pages": [], "related": [ { "id": 13310, "url": "https://svs.gsfc.nasa.gov/13310/", "page_type": "Produced Video", "title": "Hubble Finds Water Vapor On Distant Exoplanet Soundbites", "description": "Click HERE for FULL STORY about this exciting discovery.Click for quick link to soundbites from interview with Dr. Jennifer Wiseman. || Screen_Shot_2019-09-10_at_1.56.19_PM.png (2986x454) [2.2 MB] || Screen_Shot_2019-09-10_at_1.56.19_PM_print.jpg (1024x155) [50.7 KB] || Screen_Shot_2019-09-10_at_1.56.19_PM_searchweb.png (320x180) [115.4 KB] || Screen_Shot_2019-09-10_at_1.56.19_PM_thm.png (80x40) [7.8 KB] || ", "release_date": "2019-09-12T13:00:00-04:00", "update_date": "2023-05-03T13:45:39.030558-04:00", "main_image": { "id": 392818, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a013300/a013310/Screen_Shot_2019-09-10_at_1.56.19_PM_print.jpg", "filename": "Screen_Shot_2019-09-10_at_1.56.19_PM_print.jpg", "media_type": "Image", "alt_text": "Click HERE for FULL STORY about this exciting discovery.Click for quick link to soundbites from interview with Dr. Jennifer Wiseman.", "width": 1024, "height": 155, "pixels": 158720 } }, { "id": 11898, "url": "https://svs.gsfc.nasa.gov/11898/", "page_type": "Produced Video", "title": "Hubble Detects \"Sunscreen\" Layer on Distant Planet", "description": "ANIMATION Using NASA’s Hubble Telescope, scientists detected a stratosphere on the planet WASP-33b. A stratosphere occurs when molecules in the atmosphere absorb ultraviolet and visible light from the star. This absorption warms the stratosphere and acts as a kind of sunscreen layer for the planet below.Watch this video on YouTube. || CoolHotAll3av8_print.jpg (1024x576) [49.2 KB] || CoolHotAll3av8_searchweb.png (320x180) [48.2 KB] || CoolHotAll3av8_thm.png (80x40) [4.6 KB] || CoolHotAll3av8.mp4 (1920x1080) [46.7 MB] || CoolHotAll3av8sm.mp4 (1280x720) [16.4 MB] || CoolHotAll3av8sm.webm (1280x720) [2.2 MB] || ", "release_date": "2015-06-12T12:30:00-04:00", "update_date": "2023-05-03T13:49:40.568523-04:00", "main_image": { "id": 442740, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011800/a011898/CoolHotAll3av8_print.jpg", "filename": "CoolHotAll3av8_print.jpg", "media_type": "Image", "alt_text": "ANIMATION Using NASA’s Hubble Telescope, scientists detected a stratosphere on the planet WASP-33b. A stratosphere occurs when molecules in the atmosphere absorb ultraviolet and visible light from the star. This absorption warms the stratosphere and acts as a kind of sunscreen layer for the planet below.Watch this video on YouTube.", "width": 1024, "height": 576, "pixels": 589824 } }, { "id": 11413, "url": "https://svs.gsfc.nasa.gov/11413/", "page_type": "Produced Video", "title": "Exploring Outer Worlds", "description": "Since the early 1990s, astronomers have known that distant planets orbit stars light-years from Earth. Although most of these alien worlds, called exoplanets, are too far away to be imaged directly, scientists have made detailed observations of their size and composition. One method of study involves watching a planet as it transits its host star. By measuring how the brightness and color of a star changes when a planet crosses in front of its disk, astronomers can indirectly determine the mass of the planet and the proximity of its orbit. Similar measurements can provide other key information, like the chemical makeup of a planet's atmosphere. Watch the video to learn more. || ", "release_date": "2013-12-17T00:00:00-05:00", "update_date": "2023-05-03T13:51:21.501168-04:00", "main_image": { "id": 459992, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011400/a011413/cover-1024.jpg", "filename": "cover-1024.jpg", "media_type": "Image", "alt_text": "Scientists find creative ways to study the many planets that exist beyond our solar system.", "width": 1024, "height": 576, "pixels": 589824 } }, { "id": 30125, "url": "https://svs.gsfc.nasa.gov/30125/", "page_type": "Hyperwall Visual", "title": "Other Earths", "description": "NASA's Kepler mission has discovered two new planetary systems that include three super-Earth-size planets in the habitable zone, the range of distance from a star where the surface temperature of an orbiting planet might be suitable for liquid water. Two of the newly discovered planets orbit a star smaller and cooler than the sun. Kepler-62f is only 40 percent larger than Earth, making it the exoplanet closest to the size of our planet known in the habitable zone of another star. Kepler-62f is likely to have a rocky composition. Kepler-62e, orbits on the inner edge of the habitable zone and is roughly 60 percent larger than Earth. The third planet, Kepler-69c, is 70 percent larger than the size of Earth, and orbits in the habitable zone of a star similar to our sun. Astronomers are uncertain about the composition of Kepler-69c, but its orbit of 242 days around a sun-like star resembles that of our neighboring planet Venus. Scientists do not know whether life could exist on the newfound planets, but their discovery signals we are another step closer to finding a world similar to Earth around a star like our sun. || ", "release_date": "2013-10-17T12:00:00-04:00", "update_date": "2024-10-10T00:19:27.253835-04:00", "main_image": { "id": 428655, "url": "https://svs.gsfc.nasa.gov/vis/a030000/a030100/a030125/3_Kepler-69_orbitDiagram_web.jpg", "filename": "3_Kepler-69_orbitDiagram_web.jpg", "media_type": "Image", "alt_text": "Diagrams show super-Earth-size planets discovered by Kepler.", "width": 320, "height": 180, "pixels": 57600 } }, { "id": 11019, "url": "https://svs.gsfc.nasa.gov/11019/", "page_type": "Produced Video", "title": "Hubble, Swift Detect First-ever Changes in an Exoplanet Atmosphere", "description": "An international team of astronomers using data from NASA's Hubble Space Telescope has detected significant changes in the atmosphere of a planet located beyond our solar system. The scientists conclude the atmospheric variations occurred in response to a powerful eruption on the planet's host star, an event observed by NASA's Swift satellite.The exoplanet is HD 189733b, a gas giant similar to Jupiter, but about 14 percent larger and more massive. The planet circles its star at a distance of only 3 million miles, or about 30 times closer than Earth's distance from the sun, and completes an orbit every 2.2 days. Its star, named HD 189733A, is about 80 percent the size and mass of our sun.Astronomers classify the planet as a \"hot Jupiter.\" Previous Hubble observations show that the planet's deep atmosphere reaches a temperature of about 1,900 degrees Fahrenheit (1,030 C).HD 189733b periodically passes across, or transits, its parent star, and these events give astronomers an opportunity to probe its atmosphere and environment. In a previous study, a group led by Lecavelier des Etangs used Hubble to show that hydrogen gas was escaping from the planet's upper atmosphere. The finding made HD 189733b only the second-known \"evaporating\" exoplanet at the time.The system is just 63 light-years away, so close that its star can be seen with binoculars near the famous Dumbbell Nebula. This makes HD 189733b an ideal target for studying the processes that drive atmospheric escape.When HD 189733b transits its star, some of the star's light passes through the planet's atmosphere. This interaction imprints information on the composition and motion of the planet's atmosphere into the star's light.In April 2010, the researchers observed a single transit using Hubble's Space Telescope Imaging Spectrograph (STIS), but they detected no trace of the planet's atmosphere. Follow-up STIS observations in September 2011 showed a surprising reversal, with striking evidence that a plume of gas was streaming away from the exoplanet.The researchers determined that at least 1,000 tons of gas was leaving the planet's atmosphere every second. The hydrogen atoms were racing away at speeds greater than 300,000 mph. Because X-rays and extreme ultraviolet starlight heat the planet's atmosphere and likely drive its escape, the team also monitored the star with Swift's X-ray Telescope (XRT). On Sept. 7, 2011, just eight hours before Hubble was scheduled to observe the transit, Swift was monitoring the star when it unleashed a powerful flare. It brightened by 3.6 times in X-rays, a spike occurring atop emission levels that already were greater than the sun's. Astronomers estimate that HD 189733b encountered about 3 million times as many X-rays as Earth receives from a solar flare at the threshold of the X class. || ", "release_date": "2012-06-28T09:00:00-04:00", "update_date": "2023-05-03T13:52:58.908137-04:00", "main_image": { "id": 475033, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011000/a011019/Evaporating_Exoplanet_Beauty_Still.jpg", "filename": "Evaporating_Exoplanet_Beauty_Still.jpg", "media_type": "Image", "alt_text": "This artist's rendering illustrates the evaporation of HD 189733b's atmosphere in response to a powerful eruption from its host star. NASA's Hubble Space Telescope detected the escaping gases and NASA's Swift satellite caught the stellar flare.", "width": 1920, "height": 1080, "pixels": 2073600 } }, { "id": 11026, "url": "https://svs.gsfc.nasa.gov/11026/", "page_type": "Produced Video", "title": "HD 189733b Exoplanet Animation", "description": "The exoplanet HD 189733b lies so near its star that it completes an orbit every 2.2 days. In late 2011, NASA's Hubble Space Telescope found that the planet's upper atmosphere was streaming away at speeds exceeding 300,000 mph. Just before the Hubble observation, NASA's Swift detected the star blasting out a strong X-ray flare, one powerful enough to blow away part of the planet's atmosphere. || ", "release_date": "2012-06-28T09:00:00-04:00", "update_date": "2023-11-02T10:08:01.628282-04:00", "main_image": { "id": 474881, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a011000/a011026/Exo_Animation_Still.jpg", "filename": "Exo_Animation_Still.jpg", "media_type": "Image", "alt_text": "Artist's interpretation of what the exoplanet, flare, and atmosphere loss might have looked like.", "width": 1920, "height": 1080, "pixels": 2073600 } }, { "id": 10679, "url": "https://svs.gsfc.nasa.gov/10679/", "page_type": "Produced Video", "title": "Using Color to Search for Alien Earths", "description": "NASA astronomer Lucy McFadden and UCLA graduate Carolyn Crow recently made a discovery that will help identify characteristics of extrasolar planets, such as the compositions of their surfaces and atmospheres. By comparing the reflected red, blue, and green light from planets in our solar system, a team led by Crow and McFadden was able to group the planets according to their similarities. As it turns out, the planets fall into very distinct regions on this plot, where the vertical direction indicates the relative amount of blue light, and the horizontal direction the relative amount of red light. This technique works even when the source of the reflected light is visible only as a point, like exoplanets appear when observed through a telescope. Therefore, scientists can use it to identify earthlike planets more easily. || ", "release_date": "2010-11-02T09:00:00-04:00", "update_date": "2023-05-03T13:53:58.087691-04:00", "main_image": { "id": 489557, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a010600/a010679/Screen_shot_2010-10-06_at_3.16.46_PM.png", "filename": "Screen_shot_2010-10-06_at_3.16.46_PM.png", "media_type": "Image", "alt_text": "Video feature describing the process and implications of the planetary color analysis.For complete transcript, click here.", "width": 1280, "height": 720, "pixels": 921600 } } ], "sources": [], "products": [], "newer_versions": [], "older_versions": [], "alternate_versions": [] }