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The definition of planet: An ethereal body which moves around a star in orbit.

Planets are found in our solar system for example: Earth, Neptune, Jupiter, Saturn, Mars, Uranus, Mercury, and Venus are all planets that are found in our solar system.

Characteristics of a planets are:

1. Planets are in orbit around the sun

2. Planets have enough mass to overcome rigid body forces for their self- to assume a hydro- equilibrium form

3. Planets have cleaned their neighborhood around its orbit

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There are five characteristics of stars, Brightness, Colour, Size, Mass, and Surface Temperature.

Stars are distinctive because they may be unique in color, light, temperature, size and mass. Hot blue-white stars, for example, may exceed 30,000 ° C at their top, 10 times hotter than the cooler stars.

Big stars are converted into supernovae, neutron stars and black holes while regular stars like the sun end life as a white dwarf surrounded by a fading planetary nebula. All stars, however, follow approximately the same simple seven-stage life cycle, starting as a cloud of gas and ending up as a star relic.

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A galaxy is a group of billions of stars, dust and gas bound together by gravitational force. A galaxy can either be on its own or in a cluster. Galaxies come in different shapes and sizes. Scientists have divided them into three categories based on their shapes-spiral, elliptical (oval) and irregular (no shape).

There are different kinds of galaxies. there are three main types of galaxies: Elliptical, Spiral, and Irregular.

The Milky Way is a large barred spiral galaxy.

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A nebula is a cloud of cosmic dust, hydrogen, helium, and other ionized gases.

Red Giants are a very large, highly luminous star with low surface temperature. Red giants are considered to be in a late stage of evolution because there is no hydrogen left to fuel nuclear fusion at the core.

A white dwarf is, which stars are like the Sun after their nuclear fuel has been depleted. The type of star expels much of its outer material near the end of its nuclear burning period, forming a planetary nebula. Just the star's hot center remains.

A supernova is a star's eruption. This is the biggest spatially occurring blast. Supernovas are not that visible in our galaxy because of the dust.

Neutron stars are a very small radius and very high density celestial body, consisting primarily of closely packed neutrons.

A black hole is a space-time area where gravity is so intense that nothing  can escape it.

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Nuclear fusion is the process of fusing two atomic nuclei together into a larger single nucleus, which releases energy in the process. Four hydrogen atoms are fused into a single helium-4 atom in proton-proton fusion which releases a lot of energy in the process.

A typical solar flare can last from a few minutes to a few hours, and can be seen on the Sun as luminous areas. Like a flare, a prominence is fixed to the surface of the Sun, and is often defined by the form of a circle. A prominence is bound by the magnetic field of the Sun, which can last for months.

Sun-based energy is very important to Earth. The Sun heats our earth, the air, the oceans and the atmosphere. The energy to the environment is one of our weather's key engines. The amount of solar radiation obtained at Earth also strongly influences our atmosphere.

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It is believed that the numerous planets developed out of the solar nebula, the disc-shaped cloud of gas and dust left over from the creation of the Sun. The generally accepted mechanism by which the planets were created is accretion, in which the planets start in orbit around the central protostar as dust grains.

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The best-supported hypothesis about the origin of our universe focuses on an incident known as the big bang.

The Big Bang Theory is the principal interpretation of how the universe began. This means the universe at its finest as we know this started with a small singularity, then expanded into the world that we know today for the next 13.8 billion years.

The evidence we have for the big bang theory is from the fact that, at great speed in all directions, other galaxies are moving away from our own, as if they had all been driven by an ancient explosive force.

The 1925 observations were made by the American astronomer Edwin Hubble and was the first to show that the universe is expanding. He proved that the speeds of distant galaxies and their distances from Earth are directly related. This is also called the Hubble Law.