A Nebula is a giant cloud of dust and gass in space.
Other nebulae are regions where new stars are beginning to form. For this reason, some Nebulae are called "star nurseries."
Nebulea are made of dust and gases—mostly hydrogen and helium.
As these clumps get bigger and bigger, their gravity gets stronger and stronger. Eventually, the clump of dust and gas gets so big that it collapses from its own gravity.
Nebulae exits in space between the stars—also known as interstellar space. The closest known nebula to earth is called the Helix Nebula.
That means even if you could travel at the speed of light, it would still take you 700 years to get there!
Astronomers use very powerful telescopes to take pictures of of faraway Nebulae.
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