A dry planet and one with a thick atmosphere close together seems to be very weird. How about smashing one with a huge impactor?
Earth’s atmosphere is about 100 times less massive than Venus’ atmosphere. This gave rise to the idea that Earth had a more massive atmosphere, which got then depleted by impacts. This Astrobite discusses what would have been the optimal impactor size.
By combining galaxy formation histories and planet formation models, we can estimate the number of potential civilizations in our Universe.
How and where did the first organic molecules emerge? Sophisticated chemistry models for the synthesis of amino acids within planetesimals can help us to decipher these mysteries.
Planets in binary star systems can receive a sizable amount of water from asteroids getting perturbed out of their orbits
Mercury is the smallest planet in the Solar System, but some of its properties are a big challenge to explain. Today’s Astrobite presents a solution to one of these issues: The darkening of Mercury is induced by a high abundance of carbon delivered by meteorites.