Dark Energy
Overview
Some 13.8 billion years ago, the universe began with a rapid expansion we call the big bang. After this initial expansion, which lasted a fraction of a second, gravity started to slow the universe down. But the cosmos wouldn’t stay this way. Nine billion years after the universe began, its expansion started to speed up, driven by an unknown force that scientists have named dark energy.
But what exactly is dark energy?
The short answer is: We don't know. But we do know that it exists, it’s making the universe expand at an accelerating rate, and approximately 68.3 to 70% of the universe is dark energy.
Dark Energy Resources
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Roman and Dark Energy
NASA’s Roman Mission to Probe Cosmic Secrets Using Exploding Stars
Go to this pageNASA’s upcoming Nancy Grace Roman Space Telescope will see thousands of exploding stars called supernovae across vast stretches of time and space. Using these observations, astronomers aim to shine a light on several cosmic mysteries, providing a window onto the universe’s distant past and hazy present.Credit: NASA's Goddard Space Flight CenterMusic: "Relentless Data" from Universal Production MusicWatch this video on the NASA Goddard YouTube channel.Complete transcript available. || Supernova_IA_1285_print.jpg (1024x576) [53.0 KB] || Supernova_IA_1285.png (3840x2160) [5.0 MB] || Supernova_IA_1285_searchweb.png (320x180) [46.9 KB] || Supernova_IA_1285_thm.png (80x40) [4.6 KB] || 13852_Roman_Standard_Candle_Supernovae_1080_Best.webm (1920x1080) [28.3 MB] || 13852_Roman_Standard_Candle_Supernovae_1080.mp4 (1920x1080) [136.7 MB] || 13852_Roman_Standard_Candle_Supernovae_1080_Best.mp4 (1920x1080) [654.2 MB] || 13852RomanStandardCandleSupernovaeCaptionsFix.en_US.srt [4.7 KB] || 13852RomanStandardCandleSupernovaeCaptionsFix.en_US.vtt [4.7 KB] || 13852_Roman_Standard_Candle_Supernovae_ProRes_1920x1080_2997.mov (1920x1080) [3.2 GB] ||
A New Portrait of the Cosmos is Coming
Go to this pageWelcome to NASA's upcoming infrared survey mission, taking a wider view of the cosmos.Credit: NASA's Goddard Space Flight CenterMusic: "The Decision (alternate)" from Universal Production MusicWatch this video on the NASA Goddard YouTube channel.Complete transcript available. || Trailer_still_1_print.jpg (1024x576) [181.5 KB] || Trailer_still_1.jpg (3840x2160) [2.0 MB] || Trailer_still_1_searchweb.png (180x320) [104.8 KB] || Trailer_still_1_thm.png (80x40) [7.9 KB] || Roman_Space_Telescope_Trailer_ProRes_1920x1080_2997.mov (1920x1080) [797.0 MB] || Roman_Space_Telescope_Trailer_Best_1080.mp4 (1920x1080) [281.5 MB] || Roman_Space_Telescope_Trailer_1080.mp4 (1920x1080) [132.9 MB] || Roman_Space_Telescope_Trailer_1080.webm (1920x1080) [7.2 MB] || Roman_Trailer_SRT_Captions.en_US.srt [740 bytes] || Roman_Trailer_SRT_Captions.en_US.vtt [753 bytes] ||
NASA's Nancy Grace Roman Space Telescope: Broadening Our Cosmic Horizons
Go to this pageLearn about the Nancy Grace Roman Space Telescope.Credit: NASA's Goddard Space Flight CenterMusic: "Climb the Ladder" from Universal Production MusicWatch this video on the NASA Goddard YouTube channel.Complete transcript available. || Roman_Space_Telescope_Still_4.jpg (1920x1080) [166.9 KB] || Roman_Space_Telescope_Still_4_print.jpg (1024x576) [45.8 KB] || Roman_Space_Telescope_Still_4_searchweb.png (320x180) [39.6 KB] || Roman_Space_Telescope_Still_4_thm.png (80x40) [3.9 KB] || Roman_Space_Telescope_Overview_ProRes_1920x1080_2997.mov (1920x1080) [2.2 GB] || Roman_Space_Telescope_Overview_Best_1080.mp4 (1920x1080) [701.8 MB] || Roman_Space_Telescope_Overview_1080.mp4 (1920x1080) [249.0 MB] || Roman_Space_Telescope_Overview_1080.webm (1920x1080) [18.3 MB] || Roman_Overview_SRT_Captions.en_US.srt [3.0 KB] || Roman_Overview_SRT_Captions.en_US.vtt [3.0 KB] ||
Unraveling the Mysteries of Dark Energy with NASA's WFIRST
Go to this pageWatch this video to learn more about dark energy and how WFIRST will study it.Music: "Searching Everywhere" from Universal Production MusicCredit: NASA's Goddard Space Flight CenterWatch this video on the NASA Goddard YouTube channel.Complete transcript available. || Dark_Energy_Expansion_Still_print.jpg (1024x576) [164.5 KB] || Dark_Energy_Expansion_Still.jpg (3840x2160) [942.3 KB] || Dark_Energy_Expansion_Still_searchweb.png (320x180) [50.3 KB] || Dark_Energy_Expansion_Still_thm.png (80x40) [5.0 KB] || 13314_Dark_Energy_1080_good.mp4 (1920x1080) [236.4 MB] || 13314_Dark_Energy_1080.mp4 (1920x1080) [125.1 MB] || 13314_Dark_Energy_1080.webm (1920x1080) [25.4 MB] || 13314_Dark_Energy_ProRes_3840x2160_2997.mov (3840x2160) [5.5 GB] || 13314_Dark_Energy_4k_best.mp4 (3840x2160) [558.4 MB] || 13314_Dark_Energy_SRT_Captions.en_US.srt [5.0 KB] || 13314_Dark_Energy_SRT_Captions.en_US.vtt [4.9 KB] ||
How NASA's Roman Space Telescope Will Rewind the Universe
Go to this pageIn this simulated view of the deep cosmos, each dot represents a galaxy. The three small squares show Hubble's field of view, and each reveals a different region of the synthetic universe. Roman will be able to quickly survey an area as large as the whole zoomed-out image, which will give us a glimpse of the universe’s largest structures.Credits: NASA’s Goddard Space Flight Center/A. Yung || Yung_Stucture_Survey-Hubble.gif (800x800) [10.9 MB] || Yung_Structure_Survey-Hubble_ProRes.mov (800x800) [36.3 MB] || Yung_Structure_Survey-Hubble_800.mp4 (800x800) [6.4 MB] || Yung_Structure_Survey-Hubble_800.webm (800x800) [1.6 MB] ||
Far and Wide: Roman and Webb's Overlapping Roles in Understanding Our Universe
Go to this pageThe four Roman/Webb Far and Wide videos that detail the differences between the two missions, why we need both, what they will do and how they will work together.
Roman's Core Surveys Infographics
Go to this pageNASA’s Nancy Grace Roman Space Telescope’s three main observing programs, highlighted in this infographic, will enable astronomers to view the universe as never before, revealing billions of cosmic objects strewn across enormous swaths of space-time.Credit: NASA’s Goddard Space Flight Center || Roman_CoreSurveys_Infographic_print.jpg (1024x640) [155.3 KB] || Roman_CoreSurveys_Infographic.png (8000x5000) [28.6 MB] || Roman_CoreSurveys_Infographic.jpg (8000x5000) [2.5 MB] || Roman_CoreSurveys_Infographic_Half.jpg (4000x2500) [1.3 MB] || Roman_CoreSurveys_Infographic_searchweb.png (320x180) [72.9 KB] || Roman_CoreSurveys_Infographic_thm.png [6.6 KB] ||
NASA’s Roman and ESA’s Euclid Will Team Up To Investigate Dark Energy
Go to this pageEuclid (left) is a medium-class ESA mission. The Nancy Grace Roman Space Telescope (right) is an upcoming NASA flagship mission. Both will study the history of the universe and bring new insight to the mystery of dark energy.Credit: NASA's Goddard Space Flight Center; ESA/ATG medialab || Euclid-Roman_Graphic_Final.jpg (1920x1080) [476.1 KB] || Euclid-Roman_Graphic_Final_searchweb.png (320x180) [101.4 KB] || Euclid-Roman_Graphic_Final_thm.png (80x40) [7.9 KB] ||
Rebekah Hounsell 2022 AAS Roman Hyperwall Talk
Go to this pageTitle slide.Credit: NASA's Goddard Space Flight Center || rebekah_hounsell_roman_title_print.jpg (1024x576) [250.4 KB] || rebekah_hounsell_roman_title.png (3840x2160) [10.3 MB] || rebekah_hounsell_roman_title_searchweb.png (320x180) [111.8 KB] || rebekah_hounsell_roman_title_thm.png (80x40) [8.1 KB] ||
Expanding Our View (2022 STScI presentation)
Go to this pageComplete PowerPoint file with all slides and notes || PPT_still.jpg (3840x2160) [750.6 KB] || roman-expanding-our-view-presentation.pptx [76.2 MB] || Slide #1 – Onscreen before presentation begins and during introductionCredit: STScI, NASA || Slide1_print.jpg (1024x576) [98.1 KB] || Slide1.png (3840x2160) [3.4 MB] || Slide1.jpg (3840x2160) [750.6 KB] || Slide1_searchweb.png (320x180) [63.9 KB] || Slide1_thm.png (80x40) [5.6 KB] ||
History of the Universe
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