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What is a light year?
The distance light travels in one year. view more
Astronomy & Space
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What is a black hole?
A region where gravity is so strong that nothing, not even light, can escape. view more
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How far is the Moon from Earth?
384,400 km (238,855 miles) average Variation due to elliptical orbit: - Closest (perigee): 356,500 km - Farthest (apogee): 406,700 km Light takes ~1.3 seconds to travel from Moon to Earth. view more
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How many planets are in our solar system?
8 planets: Inner (rocky): 1. view more
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What is the largest planet?
Jupiter Stats: - Diameter: 139,820 km (11× Earth's) - Mass: 318× Earth's - More mass than all other planets combined - 95 known moons Mainly composed of hydrogen and helium. view more
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What causes the seasons?
Earth's 23.5° axial tilt (not distance from Sun) How it works: - Northern Hemisphere tilts toward Sun → Summer - Northern Hemisphere tilts away → Winter Southern Hemisphere has opposite seasons... view more
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How old is the universe?
Approximately 13.8 billion years Originated from the Big Bang. view more