This topic can be approached from several angles due to its complexity. Some people tend to think that we should listen to them. While others seem to disagree.
Earth's Sun[ change change source ] The star nearest to Earth is the Sun. The energy from the Sun supports almost all life on Earth by providing light for plants. Plants turn the light into energy in a process called photosynthesis. We can see other stars in the night sky when the Sun goes down.
Like the Sun, they are made mostly of hydrogen and a little bit of helium plus other elements. Astronomers often compare those other stars to the Sun. For example, their mass is given in solar masses. A small star may be 0. Planets[ change change source ] The Earth and other planets move around orbit the Sun.
The Sun and all things that orbit the Sun are called the Solar System. Many other stars have planets orbiting them: If you were on an exoplanet, our Sun would look like a star in the sky, but you could not see the Earth because it would be too far away. Numbers, distances[ change change source ] Proxima Centauri is the star that is closest to our Sun.
This means that light from Proxima Centauri takes 4. Astronomers think there are a very large number of stars in the Universe. They estimate guess that there are at least 70 sextillion stars.
That is 70,,,, which is over billion times the few hundred billion stars in the Milky Way our galaxy. Most stars are very old. They are usually thought to be between 1 billion and 10 billion years old.
The oldest stars are That is as old as the Universe. Some young stars are only a few million years old. Young stars are mostly brighter than old ones. Stars are different sizes. The smallest stars are neutron starswhich are actually dead stars.
They are no bigger than a city. The neutron star has a large amount of mass in a very small space. Hypergiant stars are the largest stars in the Universe. They have a diameter over 1, times bigger than the Sun.
If the Sun was a hypergiant star, it would reach out to as far as Jupiter. The star Betelgeuse is a red supergiant star. Although these stars are very large, they also have low density.
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