A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxias.
Science / Feb 5
Read the articleA panel of astronauts discuss building a community in space and using art to bring the experience of space home
Missions / Feb 13
Read the article249200000
km Aphelion
686.971
d Orbital period
2
Satellites