Pulsar planets were the first planets outside the solar system ever discovered, but they now appear to be very rare. What makes a pulsar planet so uncommon?
Say hello to your new neighbor. Proxima Centauri, the closest star to the Sun, has an Earth-mass planet in the habitable zone, but it wasn’t easy to find, and it’s in a bit of a dangerous place.
A gravitational tug-of-war between three stars has this planet living on the edge.
When stars move on to their final stages of life, the habitable zone around them moves outward, putting planets like Jupiter and Saturn into the habitable zone. Do these outer planets have enough time to develop life before the star dies?
Once predicted to be geologically boring and unchanging bodies, Pluto and its largest moon Charon have turned out to be surprisingly complex and even geologically active worlds.