Science Ask Astro web extra: What forces maintain Earth’s axial spin or that of any other celestial body?
Solar System Ask Astro web extra: What is the difference between a “cubewano,” “plutino,” and “Kuiper Belt object”?
Solar System Ask Astro web extra: How do the angles of the solar system’s plane and the Milky Way’s plane compare?
Science Ask Astro web extra: Why is the fourth known planet in an extrasolar system labeled with an “e”? Shouldn’t that be the fifth known planet? Or is the star always “a”?
Stars Is it true that there are more stars in the universe than there are grains of sand on Earth? How could one calculate such figures?
