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3 days ago · star, any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources. Of the tens of billions of trillions of stars composing the observable universe, only a very small percentage are visible to the naked eye. Many stars occur in pairs, multiple systems, or star clusters.
Star+ is the ultimate streaming experience with your favorite series, hit movies, animated comedies and the best sports events from ESPN. Whenever you want, wherever you want. With Star+, you...
A star is a luminous spheroid of plasma held together by self-gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night; their immense distances from Earth make them appear as fixed points of light.
- A Star Is Born
- The Main Sequence
- Color Coding
First off, a decent enough astrophysical definition of a staris: any object that is sufficiently massive that it can ignite the fusion of elements in its core due to the gravitational pressures inside the object itself. The smallest object that we know of today that is capable of such feats is around 10% the mass of our sun. In the far future, with...
Besides the small red stars, the medium white stars and the big blue stars, there are of course all the in-between stars, and some strange ones that are both large and red. A hundred years ago, when astronomers were first cataloging stars, this was absolutely a confusing mess, with apparently no rhyme or reason between a star's color and its bright...
Armed with the Hertzsprung-Russell diagram, we can see what truly defines a star: it's an object that lives on the main sequence of that diagram. It's an object that burns hydrogen and steadily evolves along that narrow strip connecting its brightness to its temperature. Things that exist outside that strip are either giants attempting to fuse heav...
A star is a huge glowing ball of hot gas, mainly hydrogen and helium. The temperature is so high in its core that nuclear fusion occurs, producing energy. The outward pressure of gas heated by fusion is balanced by the inward pull of gravity, leaving the star in hydrostatic equilibrium.
- Is the sun the biggest star?no the sun not the biggest star in the universe. the biggest that we know of is VY Canis Majoris which is about a million times bigger than the sun
- What exactly is nuclear fusion? (first paragraph)From the wiki: "A nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy." Which is...
- Do stars rotate and revolve?Yes, our Sun rotates about once every 25 days, although the speeds of rotation vary from the equator to the poles. It orbits the galaxy once every...
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Mar 20, 2019 · Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores. Aside from our sun, the dots of light we see in...
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.
