What Is The Universe? 
The Universe contains billions of galaxies, each containing millions or billions of stars. The space between the stars and galaxies is largely empty. However, even places far from stars and planets contain scattered particles of dust or a few hydrogen atoms per cubic centimeter. Space is also filled with radiation (e.g., light and heat), magnetic fields, and high-energy particles (e.g., cosmic rays).
Everything you see around you, from your own body to the planet you're standing on and the stars in the sky, is made of atoms. These, in turn, are made up of smaller particles like protons and neutrons
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The Universe has not always been the same size. The Universe has been expanding outward at a very high speed. So the area of space we now see is billions of times bigger than when the Universe was very young. The galaxies are also moving further apart as the space between them expands.
The Universe includes space and time and their contents, planets, stars, galaxies, and other objects and energies. While the external nature of the entire universe is not yet known, we can measure the visible universe.
The Sun is one of the hundreds of billions of stars in the galaxy. Hundreds of tens of thousands of galaxies in space are called galaxies.
MILKY WAY GALAXY:
- ·The Milky Way is a galaxy that contains our solar system. Indistinguishable by our eyes directly. Galileo Galilei first determined the light star as a separate star in 1610 with the help of his telescope. In the early 1920s, most astronomers thought the Milky Way contained all the stars.
- The Milky Way galaxy contains many galaxies and is part of the Milky Way galaxy.
SOLAR SYSTEM:
- There are eight planets in the sun, all orbiting the sun.
- These eight planets are classified as solar systems and gas planets. Mercury, space, Earth, and Mars are called Solid Planets. Jupiter, Saturn, Uranus, and Neptune are the gas planets.
DWARF PLANETS:
- Pluto, Saron, Series, and Eris were grouped into new groups in 2008 as "Dwarf Planets." They revolve around the sun. They are tiny. Their size is smaller than ours.
ASTEROIDS:
- Thousands of meteors are found between Mars and Jupiter. 300 to 400 km. Meteors are clusters of galaxies that contain small rocks and large rocks that can be measured up to a diameter.
METEOROIDS:
- The light that is suddenly visible to our eyes in the sky is called METEOROIDS. When the rocky parts of the atmosphere remain, they will strike the Earth's atmosphere and form spheres of light. Then these can be seen. They are not falling stars.
COMET:
- Comets are visible to our eyes at night. The comet is not a star. It is a rock made of dust and ice. It has long tails because when the comet approaches the sun, the ice melts and reflects the sun's light.
- The tail is seen in the opposite direction of the sun.
- The tail appears as minute particles of the sun attack the area of gas emanating from the tail.
BLACKHOLE:
- Black holes are not large areas. But when you reach their masses, they are the best competitors for the biggest things in the universe. And quasar OJ287 is the largest black hole we have ever seen.
MOON:
- The moon is called by various names in Tamil. The moon is not a planet. The moon does not orbit directly around the sun. It revolves around the earth. Hence it is called Satellite.·
- The moon is the Earth's satellite.
DARK MATTER:
- Dark matter is a type of hypothesis unknown to the entire electromagnet, but it refers to most things in the universe.
- The location and properties of dark matter are known from its gravitational effects, radiation, and the large-scale structure of the universe.
- Apart from neutrinos, no other dark matter has been detected directly, which is one of the greatest mysteries of modern astronomy.
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