Proxima Centauri is a red dwarf star that is located about 4.2 light-years from Earth. It is the closest star to Earth, and it is part of the Alpha Centauri system.

Mercury is the closest planet to the Sun. It is a small, rocky planet that is about the size of Earth's moon.

Jupiter is the largest planet in the solar system. It is a gas giant that is about 11 times the diameter of Earth.

Mercury is the smallest planet in the solar system. It is a small, rocky planet that is about the size of Earth's moon.

Sagittarius A* is a supermassive black hole that is located at the center of our galaxy. It is about 4 million times the mass of the Sun.

Andromeda is the galaxy that is closest to our galaxy. It is a spiral galaxy that is about 2.5 million light-years away.

IC 1101 is the largest galaxy in the universe. It is an elliptical galaxy that is about 6 million light-years across.

HD 140283 is the oldest star in the universe. It is a metal-poor star that is about 13.2 billion years old.

51 Pegasi b is the first exoplanet that was discovered. It is a gas giant that is about half the mass of Jupiter.

'Oumuamua is the first interstellar object that was discovered. It is a small, cigar-shaped object that is about 400 meters long.

TON 618 is the largest black hole in the universe. It is a supermassive black hole that is about 66 billion times the mass of the Sun.

Hubble Space Telescope is the first space telescope that was launched. It was launched in 1990 and has revolutionized our understanding of the universe.

Neil Armstrong was the first person to walk on the moon. He did so on July 20, 1969, as part of the Apollo 11 mission.

Mariner 4 was the first space probe that was sent to Mars. It was launched in 1964 and flew by Mars in 1965.