Here are some differences between planets and stars:

⇒ Composition: Planets are made of solids, liquids, and gases, while stars are giant balls of hot gas.

⇒ Light: Stars produce their own light through nuclear fusion, while planets reflect light from an external source, usually the sun.

⇒ Temperature: Stars are very hot, while planets are relatively cool.

⇒ Size: Stars are much larger than planets.

⇒ Movement: Planets orbit the sun and spin on their own axis, while stars change position due to their distance.

⇒ Twinkling: Stars twinkle in the sky due to atmospheric refraction, while planets do not twinkle. 

The Sun together with eight planets and the other group of celestial bodies forms the Solar system. These planets and bodies revolve around the Sun and are held by its attraction. Our solar system consists of an average star we call the Sun, the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

⇒ Mercury - 57.9 million km

⇒ Venus - 108.2 million km

⇒ Earth - 149.6 million km

⇒ Mars - 227.9 million km

⇒ Jupiter - 778.3 million km

⇒ Saturn - 1,427.0 million km

⇒ Uranus - 2,871.0 million km

⇒ Neptune - 4,497.1 million km

Earth is a unique planet because it has the right conditions to support life. These conditions include:

⇒ Liquid water: Earth is mostly covered in liquid water, which is essential for life.

⇒ Moderate temperature: Earth's temperature is not too hot or too cold, which allows liquid water to exist for long periods of time.

⇒ Protective atmosphere: Earth's atmosphere contains oxygen and other gases that are necessary for life.

⇒ Active plate tectonics: Earth's surface is made up of rigid plates that move and collide, causing earthquakes, volcanoes, and mountain building.

⇒ Diverse ecosystems: Earth has a wide variety of ecosystems that support many different life forms.

⇒ Stable climate: Earth has a stable climate that allows life to thrive.

Moon's rotation period (27.3 days) is the same as its revolution period (27.3 days) around Earth. This is called synchronous rotation. This Happens because of Tidal Locking.

⭕Additional iNFO: Tidal Locking⭕

⇒ Gravitational Interaction: The Earth exerts a gravitational pull on the Moon, which creates tidal forces. These forces have caused the Moon's rotation to slow down over millions of years. (Note: On Earth, the Moon's gravitational pull causes the oceans to bulge out on both the side closest to the Moon and the side farthest from the Moon)

⇒ Energy Dissipation: As the Moon rotated, the gravitational pull from the Earth created bulges on the Moon. The rotation caused these bulges to shift, leading to a torque that gradually slowed the Moon's rotation until it synchronized with its orbital period around the Earth.

Implications

⇒ Same Side Visibility: Because of this synchronous rotation, the same lunar surface (the near side) is always facing Earth, while the opposite side (the far side) remains hidden from view.

⇒ Long-term Stability: Tidal locking is a stable configuration for celestial bodies, and it can occur for moons around planets or planets around stars.

The universe is everything that exists, including all matter, energy, space, time, and all the structures they form

⇒ Matter: Atoms, subatomic particles, and everything they compose

⇒ Energy: Radiation, high energy particles, and magnetic fields

⇒ Space: All of space, including the space between stars and planets

⇒ Time: The universe includes time itself

⇒ Structures: Galaxies, planets, stars, dust clouds, nebulae, and more

Venus is called Earth's twin because it's similar in size, mass, and composition to Earth.

The earth is the third nearest planet to the sun. The planets in order from the sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

When an object moves or revolves around the other object in an elongated path, it is called Elliptical orbit. All the planets in our solar system move in an elongated path around the sun. The same is with our natural satellite which is the moon.

The North star indicates the north direction. It is also called the Pole Star. It always remains in the same position in the sky. We can locate the position of the Pole Star with the help of the Saptarishi.

Groups of galaxies are the smallest aggregates of galaxies. They typically contain no more than 50 galaxies in a diameter of 1 to 2 megaparsecs. Our Galaxy Group is Called the Local Group. The Milky Way and Andromeda galaxies are the two large galaxies in the Local Group. There are a few dozen smaller galaxies in the group, including the Magellanic Clouds, the dwarf elliptical Messier 32, the small spiral galaxy Messier 33, and many small dwarf galaxies.

The Local Galaxy Group is contained in much larger entity called the Virgo Supercluster. When we talk of the Observable Universe then Superclusters are one of the biggest entities. There are usually many clusters of galaxies in a supercluster, or a single very large cluster at its center, along with many other groups and collections of galaxies that are collected in the supercluster’s central gravitational field.