... Eta Carinae in X Rays . ... Eta Carinae is the one of the most luminous star systems in our Galaxy, radiating millions of times more power than our Sun. Eta Carinae is also one of the strangest star systems known, brightening and fading greatly since the early 1800s. Triton: Neptune's Largest Moon . ... The Frothy Milky Way . ... Astronomers have discovered that looking at dust along the plane of our Milky Way Galaxy is a bit like looking into a frothy glass of beer. ... Polaris: The North Star . ...