Exoplanets, Planets Ask Astro: How do scientists determine the chemical compositions of the planets and stars?
Science How are so many exoplanets detected via transits, while transits of Mercury and Venus are so rare? Do all the chance transit alignments fit statistically?
Science What is metallic hydrogen, and does it exist at the core of all the gas giants in our solar system?
Exoplanets I have heard that exoplanet Kepler-1625b might have an exomoon. Is it possible for two planets to be in a binary system around a single star?
Solar System Does (or will) the planet Venus get hotter as years and centuries pass, or will it stay at the same temperature?
