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?
Solar System Is Jupiter’s moon Io gradually losing mass because of all the volcanic activity? And if so, what will be the moon’s final fate?
Exotic Objects Has a meteorite ever been found that is suspected to have come from a solar system other than our own? How would we recognize such a meteorite?
Science Gamma radiation from space has very high energy levels. What is the theoretical limit on the energies of gamma-ray photons? Is there a current technology to detect and measure the highest energy level?
