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A single teaspoon of a neutron star would weigh billions of tons.

A single teaspoon of a neutron star would weigh billions of tons.

A neutron star is what's left after a giant star collapses. Its material is squeezed together so tightly that just one teaspoonful would weigh about as much as a whole mountain.

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More facts about Sun Moon Stars

The Sun is so big that about 1.3 million Earths could fit inside it. The Sun is so big that about 1.3 million Earths could fit inside it. The Sun is a giant ball of hot, glowing gas. The Sun is a giant ball of hot, glowing gas. The Moon has no light of its own — it reflects the Sun. The Moon has no light of its own — it reflects the Sun. Stars twinkle because their light wobbles through our air. Stars twinkle because their light wobbles through our air. The Moon's shape seems to change a little each night. The Moon's shape seems to change a little each night.