What is Universe and how did it begin?
What we see at night in the sky hundreds of thousand tiny points of light, actually, they are some planets, some are stars, some are even galaxies, and many others celestial bodies. These all cosmic objects are very small parts of an extremely vast space That is a Universe.
It may be the great mystery behind that, scientists believe that some 15 billion years ago the universe began as an explosion of the cloud of gases and the effect known as the Big-Bang effect.
Astarisanastronomicalobjectconsistingofaluminousspheroidofplasmaheldtogetherbyitsowngravity. Starsmadeupofhotglowinggases, they produce their own heat and light. TheneareststartoEarthistheSun.
Agalaxyisahugecollectionofgas, dust, and billions of stars and their solar systems.Agalaxyisheldtogetherbygravity.ThefamilyoftheSunincludingotherplanetsandEarthisapartofGalaxy.OurgalaxyknownasAkash-GangaortheMilkyWay.
Type of Galaxies:
– Spiral (Milky Way)
This is Spiral Galaxy called the Akash-Ganga. The Sun and Planet Earth are a part of this galaxy.
Solar System means related to Sun. The family of Sun is therefore called the Sun family or Solar system.
“The Solar system is the gravitational bound system of the Sun and the object that orbit it. Our Solar system is the collection of eight planets and their Moons in the orbit around the Sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.”
Mercury is the 1stand smallest planet in the Solar System and the closest to the Sun. Its orbit around the Sun takes 87.97 Earth days, the shortest of all the Sun’splanets.
•Distance from Sun:57.91millionkm
•Orbital period:88daysSolar Planets
Venus is the 2ndplanet from the Sun. It is named after the Roman goddess of love and beauty. As the brightest natural object in Earth’s night sky after the Moon.
•Distance from Sun:108.2millionkm
•Orbital period:225daysSolar Planets
Earth is the 3rdplanet from the Sun and the only astronomical object known to harbor life. About 29.2% of Earth’s surface is land consisting of continents and islands.
Earth is a terrestrial planet with one Moon that is suitable for life. Earth is also the only planet with liquid, gas, and water.
•Distance from Sun:149.6millionkm
Mars is the 4thplanet from the Sun and the second-smallest planet in the Solar System, being larger than only Mercury. In English, Mars carries the name of the Roman god of war and is often referred to as the “Red Planet”.
•Distance from Sun:245.9millionkm
•Orbital period:687daysSolar Planets
Jupiter is the 5thplanet from the Sun and the largest in the Solar System. It is a gas giant with a mass two and a half times that of all the other planets in the Solar System combined, but a little less than one-thousandth the mass of the Sun.
•Distance from Sun:757.33millionkm
•Orbital period:12 YearsSolar Planets
Saturn is the 6thplanet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius of about nine and a half times that of Earth. It only has one-eighth the average density of Earth; however, with its larger volume, Saturn is over 95 times more massive.
•Distance from Sun:1.434billionkm
•Orbital period:29 YearsSolar
Uranus is the 7thplanet from the Sun. Its name is a reference to the Greek god of the sky, Uranus, who, according to Greek mythology, was the grandfather of Zeus and father of Cronus. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System.
•Distance from Sun:2.871billionkm
Neptune is the 8thand farthest-known Solar planet from the Sun. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet.
•Distance from Sun:4.495billionkm
•Orbital period:165YearsSolar Planets
The Moon (Satellite):
The Moon is Earth’s only proper natural satellite. At one-quarter the diameter of Earth, it is the largest natural satellite in the Solar System relative to the size of its planet, and the fifth largest satellite in the Solar System overall.
•Distance from Sun:384400km
•Orbital period (Earth):27.23daysSolar
The Sun (Star):
The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy mainly as visible light and infrared radiation. It is by far the most important source of energy for life on Earth. Solar Planets
Asteroids: Asteroids are small, rocky objects that orbit the Sun. Althoughasteroidsorbit the Sun-like planets, they are much smaller than planets.
Meteoroid: A Meteoroid is a small rocky or metallic body in outer space. Meteoroids are significantly smaller than asteroids and range in size from small grains to one-meter-wide objects.
Comets: Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ice. They range from a few miles to tens of miles wide.
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