This artist’s impression shows the formation of a gas giant planet in the ring of dust around the young star HD This system is also suspected to contain another large planet orbiting closer to the star. CREDIT: ESO/L.
Scientists say they have found a planet seven times more massive than Earth orbiting in a star's habitable zone 42 light-years away. It could have seas, and perhaps just as important, it could have an Earth-like climate because it has a day-night cycle.
Galaxies on a String. Galaxies NGC 5216 (top right) and NGC 5218 really do look like they are connected by a string. Of course, that string is a cosmic trail of gas, dust, and stars about light-years long.