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Astronomers estimate that the universe could contain up to one septillion stars – that’s a one followed by 24 zeros. Our Milky Way alone contains more than 100 billion, including our most well-studied star, the Sun. Stars are giant balls of hot gas – mostly hydrogen, with some helium and small amounts of other elements.
- Types of Stars. The universe’s stars range in brightness, size, color, and behavior. Some types change into others very quickly, while others stay relatively unchanged over trillions of years.
- Main Sequence Stars. A normal star forms from a clump of dust and gas in a stellar nursery. Over hundreds of thousands of years, the clump gains mass, starts to spin, and heats up.
- Red Giants. When a main sequence star less than eight times the Sun’s mass runs out of hydrogen in its core, it starts to collapse because the energy produced by fusion is the only force fighting gravity’s tendency to pull matter together.
- White Dwarfs. After a red giant has shed all its atmosphere, only the core remains. Scientists call this kind of stellar remnant a white dwarf. A white dwarf is usually Earth-size but hundreds of thousands of times more massive.
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Stars are spherical balls of hot, ionized gas, or plasma, held together by their own gravity. Stars are the most fundamental building blocks of our universe. Milky Way, Stars. How many...
Oct 13, 2023 · Astronomy. Stars. How Do Stars Form? A Stellar Journey from Dust to Dazzle. By: Robert Lamb & Austin Henderson | Updated: Oct 13, 2023. If you're lucky, you see the stars glimmering overhead each night. But how do those flecks of light come into existence? Pedro Díaz Molins / Getty Images.
Exploring the Birth of Stars. Hubble’s near-infrared instruments see through the gas and dust clouds surrounding newborn stars. Stars form in large clouds of gas and dust called nebulae that scatter the visible wavelengths of light our eyes can see. The longer wavelengths of infrared light can pass through the cloud relatively undisturbed.
Mar 19, 2023 · In the beginning… All stars form from a cloud of dust and gas when turbulence pushes enough of that material together, pressed into one body by gravity. As that clump collapses in on itself, it...
