The Oldest Galaxy We've Yet Encountered

Favorite
The Oldest Galaxy We've Yet Encountered
- -
Astronomers have caught a glimpse of the farthest, most ancient galaxy to date, a star factory that was bustling with activity a mere 700 million years after the big bang.

Dwarf Galaxy Gives Clue to Formation of Supermassive Black Hole

Favorite
Dwarf Galaxy Gives Clue to Formation of Supermassive Black Hole
- -
In February of 2012, astronomers using NASA's Hubble Space Telescope discovered a cluster of young, blue stars in the spectacular edge-on galaxy (ESO 243-49 above), encircling the first intermediate-mass black hole ever found. The presence of the star cluster suggests that the black hole was once at the core of a now-disintegrated dwarf galaxy.

M31 & M33

Favorite
M31 & M33
- -
Although they look far apart, M31 and M33 are locked in a mutual gravitational embrace. Radio astronomers have found indications of a bridge of neutral hydrogen gas that could connect the two, evidence of a closer encounter in the past. Based on measurements, gravitational simulations currently predict that the Milky Way, M31, and M33 will all undergo mutual close encounters and potentially mergers, billions of years in the future.
See more at NASA