because they were made from hot atoms
gas and dust.
Nebulae are not stars. They are clouds of dust, hydrogen, helium, and other ionized gases in space where stars are born. Some nebulae can be observed because of the light of nearby stars reflecting off their gas and dust.
Reflection nebulae are illuminated by nearby stars, as they reflect the starlight off of their surrounding gas and dust. The dust in reflection nebulae scatters shorter blue wavelengths of light, giving them a blue appearance.
(Sorry this isn't all scientific) The radiation given off stars illuminates the gas and dust in the galaxy revealing a pattern or shape
Comets have a stream of gas and dust coming off them.
hydrogen
A nebula.
200 stars
Inhaling Dust-off from its canned container can kill someone. It is a computer cleaner that contains refrigerant gas that can cause suffocation when inhaled.
Stars.
How do I start my gas boiler when the flame turned off??
A comet is made of ice, rock, and dust, and as it approaches the sun, the heat causes the ice to vaporize, releasing gas and dust that forms a glowing tail. This tail is what gives comets their spectacular appearance as they travel through space.