When were exoplanets first discovered

He is based on the rotation of some planets, and there are changes in orbit seen through astronomical telescopes. It will also be detected by stellar observation.

It was discovered by using detectors, and the results are very good, especially in recent years, where a lot of detectors have happened.

Astronomical telescopes, this tool helps people to see far, far away places and can see what is happening in each place.

The first asteroid to be discovered was Ceres.

Ceres is the smallest and only dwarf planet in the solar system located in the asteroid belt. Discovered by the Italian astronomer Piazzi and published on January 1, 1801.

Ceres is likely to be a divergent planet with a rocky rocky core, and the mantle layer contains a large amount of icy water, and a large number of water-carrying minerals have been detected from the ground to the surface of the planet. It is tentatively speculated that water makes up 40% of Ceres' volume. Ceres can also obtain its energy from the sun, as it is only one AU from the Sun, compared to Europa and Enceladus, which are 9 AU away.

1.Mercury: Discovered by the Sumerians around the 3rd millennium BC and accurately determined by Pluto in 1978, Mercury was considered the smallest and least massive planet in the solar system.

2.Venus: In the early 17th century, Galileo Galilei invented the first telescope to observe the roundness of Venus, a discovery that refuted geocentrism and provided strong evidence for Copernicus' heliocentric system.

3.Earth. The concept that the earth is spherical was first proposed by the Greek philosopher Pythagoras in the fifth and sixth centuries BC.

Subsequently, Aristotle gave the first scientific evidence that the Earth was a sphere based on the appearance of the Earth's shadow on the surface of the Moon during a lunar eclipse, and in the third century BC, the ancient Greek astronomer Eratosthenes calculated the circumference of the Earth for the first time.

4.Mars: There are many places similar to Earth, but due to the limited conditions of early astronomical observations, Mars observations rely only on subjective records, and the errors are large. In the sixties and seventies of the 20th century, American space probes landed on Mars.

5.Jupiter: Jupiter is second only to Venus in brightness, ancient China used it to date, Western astronomers called Jupiter "Jupiter", in March 1979 the spacecraft "Voyager" 1 discovered that Jupiter also has rings, but very dim, almost invisible on Earth.

6.Saturn: When Galileo Galilei observed Saturn with a homemade telescope in 1610, he mistakenly thought that Saturn was made of two bodies, and did not think that he was the first person to see Saturn's rings. Half a century later, Dutch astronomer Huygens unraveled the mystery of Saturn's rings.

7.Uranus: In 1783, Uranus was confirmed to exist. Due to its rather slow orbital cycle, Uranus has been mistaken for a star many times in history.

8.Neptune: Soon after Uranus's discovery, it was noticed that it was moving strangely and always deviated from the orbit of the celestial body, which led to speculation that it might be caused by interference from another planet.

On September 18, 1846, the French Observatory's Whivesier calculated the planet's orbit and mass, and named it Neptune.

9.Pluto: the latest planet to be discovered, on February 18, 1930, Clyde Tombolo discovered the planet in a negative of the constellation Gemini.