01 Jan, 1970
Discover the staggering estimated number of stars in the observable universe (2×10²³), how astronomers calculate it, the challenges involved, historical estimates, and key facts. Updated with latest methods.
Discover how many planets actually have rings in our solar system (spoiler: 4!). Learn why Saturn's rings dominate visibility, how Jupiter/Uranus/Neptune's rings differ, and why rocky planets lack them.