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Alien Life, Cosmology

Ask Astro: If the universe is 13.8 billion years old, shouldn’t other life have existed before us?

Ask Astro: How far away is the cosmic microwave background?

Solar System, Stars

Ask Astro: Does our Oort Cloud overlap with Alpha Centauri’s?

Ask Astro: How is Earth the only known planet with active plate tectonics?

Science, Solar System

Ask Astro: How far could a pro golfer hit a ball on the Moon?

Robotic Spaceflight, Solar System, Space Exploration

Ask Astro: Why will Europa Clipper orbit Jupiter instead of Europa?

Exotic Objects, Stars

Ask Astro: What are the differences between supernovae, kilonovae, and hypernovae?

Human Spaceflight, Space Exploration

Ask Astro: Could the International Space Station park in one spot over Earth?

Ask Astro: What are the largest Near-Earth Objects?

Ask Astro: How would a volcanic eruption affect a lunar eclipse?

Exoplanets, Milky Way, Stars

Ask Astro: Is Sirius part of the Milky Way? Does it have any planets?

Ask Astro: What is the Caloris Basin on Mercury — and how did it form?