Universe  ID: 30686

Galaxy Collisions: Simulation vs Observations

Galaxies are vast swarms of billions of stars along with huge interstellar clouds of gas and dust. A spiral galaxy has a broad, thin disk shape, with a bulge of stars in its core, Within the disk are winding arms of dark dust lanes and bright star-forming regions, This structure is stable when left alone, but is relatively easily disturbed when another galaxy passes near. Astronomers have studied galaxy interactions for decades, and Hubble's keen vision has been particularly useful for examining new details.

A 2008 Hubble press release unveiled 59 images of galaxy interactions. Each image, however, captures only one moment in a billion-year-long collision process. This visualization of a galaxy collision supercomputer simulation shows the entire collision sequence, and compares the different stages of the collision to different interacting galaxy pairs observed by Hubble. The two spiral galaxies in the simulation distort, twist, and merge together, matching different images at different times and different viewing angles. With this combination of research simulations and high resolution observations, these titanic crashes can be better illustrated and understood.

For More Information

http://hubblesite.org/newscenter/archive/releases/2008/16/


Credits

Frank Summers (STScI): Lead Visualizer
Lars Hernquist (Harvard University): Project Support
Chris Mihos (Case Western Reserve University): Project Support
Please give credit for this item to:
Visualization: F. Summers (STScI)
Simulation: C. Mihos (CWRU) & L. Hernquist (Harvard)

Short URL to share this page:
http://svs.gsfc.nasa.gov/30686

Mission:
Hubble

Keywords:
SVS >> Galaxy
SVS >> HDTV
SVS >> Hyperwall
SVS >> Hubble Space Telescope
SVS >> Astrophysics
SVS >> Universe
SVS >> Space
SVS >> Collisions in Space
NASA Science >> Universe
SVS >> Presentation