Antennae Galaxies
Photograph courtesy NASA, ESA, and the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration
A Hubble Space Telescope image shows unprecedented detail of the Antennae galaxies, an intense star-forming region created when two galaxies began to collide some 200 million to 300 million years ago. The bright, blue-white areas show newly formed stars surrounded by clouds of hydrogen, which are colored pink. A similar collision is expected between our galaxy, the Milky Way, and the nearby Andromeda galaxy in several billion years.
Andromeda Galaxy
Photograph courtesy NASA/JPL/California Institute of Technology
The Andromeda galaxy, also known as Messier 31, is the largest neighboring galaxy to the Milky Way. This photo, a mosaic of ten images captured by the Galaxy Evolution Explorer spacecraft in 2003, shows blue-white regions along the galaxy's arms where new stars are forming and a central orange-white area containing older, cooler stars.
Cartwheel Galaxy
Photograph courtesy NASA/JPL-Caltech
This false-color view of the Cartwheel galaxy was created by combining images captured by four space telescopes: Galaxy Evolution Explorer, Hubble Space Telescope, Spitzer Space Telescope, and Chandra X-ray Observatory. Astronomers think a smaller galaxy, possibly one of two galaxies seen here (bottom left), passed through the center of the Cartwheel galaxy about 100 million years ago.
