Definition

SPACE

Radiation invisible to human eyes

This means that when humans send a satellite to a distant planet, the object will not encounter "drag" in the same way that an airplane does as it sails through space.

Black holes

Smaller black holes can form from the gravitational collapse of a gigantic star, which forms a singularity from which nothing can escape — not even light, hence the name of the object.

Stars, planets, asteroids and comets

Stars, planets, asteroids and comets are the building blocks of the solar system. Apart from that, there are also suns, meteoroids and satellites.

Galaxies and quasars

There are several types of galaxies, ranging from spiral to elliptical to irregular, and they can change as they come close to other objects or as stars within them age.

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Planets

Earth

Earth, our home, is the third planet from the sun. It's the only planet known to have an atmosphere containing free oxygen, oceans of water on its surface and, of course, life.

Earth is the fifth largest of the planets in the solar system. It's smaller than the four gas giants — Jupiter, Saturn, Uranus and Neptune — but larger than the three other rocky planets, Mercury, Mars and Venus.

Earth has a diameter of roughly 8,000 miles (13,000 kilometers) and is round because gravity pulls matter into a ball. But, it's not perfectly round. Earth is really an "oblate spheroid," because its spin causes it to be squashed at its poles and swollen at the equator.

Saturn

Within the solar system there is a planet that is different than the others. If we look at the planetary shapes depicted in the solar system, we will see that there is a planet covered by a ring. Because it is covered with this ring, this planet is very unique and also looks beautiful. Well, the planet that only exists is called the planet Saturn.

The planet Saturn is a group of outer planets and also a group of giant planets because of its relatively large size. And because of the ownership of this giant ring, Saturn is also known as a ringed planet. The size of the planet Saturn turns out to be the second largest in the solar system after Jupiter. Of us, maybe we don't know Saturn too much because it is very far away which does not support doing much research there.

Neptune

Neptune is the farthest (eighth) planet when viewed from the Sun. This planet is named after the Roman god of the seas. Neptune is the fourth largest planet by diameter (49,530 km) and the third largest by mass. Neptune's mass is recorded to be 17 times greater than that of Earth, and slightly larger than that of Uranus. Neptune orbits the Sun at a distance of 30.1 AU or about 4,450 million km. The planet's rotation period is 16.1 hours, while the revolutionary period is 164.8 years. Its astronomical symbol is ♆, which is the trident of the god Neptune.

Neptune was discovered on September 23, 1846. This planet is the first planet discovered through mathematical predictions. An unexpected change in Uranus' orbit led Alexis Bouvard to conclude that it was the result of gravitational disturbances from an unknown planet. Neptune was next observed by Johann Galle in the position predicted by Urbain Le Verrier.

Jupiter

upiter is the fifth closest planet to the center of the solar system after Mercury, Venus, Earth and Mars. Its distance from the sun averages 778.3 million km. This planet is the largest and heaviest planet in our solar system. Its equatorial diameter reaches 149,980 km with a mass 318 times the mass of the earth. Its enormous size and consists of gas clusters classify Jupiter as a Jovian planet with Saturn, Uranus and Neptune.

The name Jupiter is taken from the name of the king of the gods in ancient Rome who was the most important god in the second Pantheon. In favorable sky conditions, Jupiter can be directly observed with the naked eye as the fourth brightest object in the sky after the Sun, Moon and Venus. However, at certain times Mars can look brighter than Jupiter.

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Most Famous Astronomers

Nicolaus Copernicus

(1473-1543)

Copernicus, of Poland, felt the Ptolemaic view of the planets traveling in circular orbits around the Earth was over-complicated with many smaller circles, epicycles, needed to explain the intermittent retrograde motion of the planets (in which they appear to move in the opposite direction of the the stars).

Albert Einstein

(1879–1955)

Einstein’s first revolutionary innovation came in the form of his special theory of relativity which states that the laws of physics are the same everywhere in the universe.

Stephen Hawking

(1942-2018)

Hawking's primary discovery stated that since the universe began (at the Big Bang), it must come to an end. Hawking demonstrated that since Einstein’s general theory of relativity suggested that space and time began at the birth of the universe, and ends within black holes.

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