The event horizon marks the boundary around a black hole.
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The Moon completes an orbit around Earth in about 27 days.
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The largest volcano is on Mars.
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The Pioneer 10 spacecraft was the first to travel through the asteroid belt.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Comets are made of ice, dust, and rocky material.
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The James Webb Space Telescope observes distant galaxies in infrared light.
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The Milky Way galaxy is part of the Local Group.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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