In 1961, Yuri Gagarin became the first human in space.
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The Vostok 1 mission marked the first human spaceflight.
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The Sun accounts for more than 99% of the mass of our solar system.
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The Voyager Golden Record was sent into space containing sounds and images from Earth.
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The James Webb Space Telescope observes distant galaxies in infrared light.
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Some galaxies contain supermassive black holes millions of times the Sun’s mass.
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There are more trees than stars in our galaxy.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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There are rogue planets drifting through space with no star at all.
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