Nebulae are made of dust and gases—mostly hydrogen and helium. The dust and gases in a nebula are very spread out, but gravity can slowly begin to pull together clumps of dust and gas. As these clumps get bigger and bigger, their gravity gets stronger and stronger. This landscape of "mountains" and "valleys" … See more Nebulae exist in the space between the stars—also known as interstellar space. The closest known nebula to Earth is called the Helix Nebula. It is the remnant of a … See more Astronomers use very powerful telescopes to take pictures of faraway nebulae. Space telescopes such as NASA's Spitzer Space Telescope and Hubble Space … See more WebDec 22, 2015 · After 500,000 years or so, only half of the Sun’s current mass will remain and its outer envelope will begin to form a planetary nebula. The post-AGB evolution will be even faster, as the ejected...

Planetary nebula Definition, Temperature, Size, & Facts

WebStar formation begins in relatively small molecular clouds called dense cores. Each dense core is initially in balance between self-gravity, which tends to compress the object, and … WebA star forms from massive clouds of dust and gas in space, also known as a nebula. Nebulae are mostly composed of hydrogen. Gravity begins to pull the dust and gas … how much are moon boots

How stars are born and die Astronomy.com

WebThe star, now powered by helium, starts to shrink, get hotter and turn blue. However, the star's supply of helium quickly runs out, so this stage only lasts for about a million years. When the helium runs out, the core shrinks … WebJul 6, 2016 · Stars come from nebulas and end up turning into nebulas. Likewise, nebulas can generally be classified into two categories: about-to-be-stars and used-to-be-stars. About to be stars One could argue... WebThe dying star then sheds those layers to make a planetary nebula. The new nebula contains chemicals that were present when the star formed, but also new ones: atoms formed via … how much are monthly hotel rates