Jupiter

Jupiter is the most massive planet in the solar system, ranking overwhelmingly first in both mass and volume. It has a large Great Red Spot, which is believed to be a gigantic storm. Jupiter also has many moons, including the famous group known as the Galilean satellites.

black hole

In May 2019, an international collaborative research team from the Event Horizon Telescope (EHT) project succeeded in capturing the first-ever image of a black hole. This black hole resides at the center of the galaxy M87, and because it is located about 55 million light-years from Earth, capturing it required extremely advanced technology.

hydrogen

The most abundant element in the universe is hydrogen. It accounts for about 75% of the total mass of the universe and is considered essential for the formation of stars. When the universe was born, atomic nuclei and electrons were in an ionized state, but as the temperature dropped, they became neutral atoms.

About 0%

Most of the universe is an almost perfect vacuum, with only extremely tenuous gas and particles scattered about. The average density of outer space amounts to just a few atoms per cubic meter. The situation on Earth—where oxygen makes up about 21% of the atmosphere—is an exceptional case; on a universal scale, the proportion of oxygen is effectively 0%. Oxygen does exist within interstellar matter, but it appears in atomic or molecular form and constitutes only a minute fraction of the universe as a whole.

100km

Space is generally considered to begin at an altitude of 100 kilometers above the Earth’s surface. This boundary, known as the Kármán line, is defined by the Fédération Aéronautique Internationale (FAI) as the start of space. Astronauts who cross this altitude are recognized as having achieved spaceflight.

Toyohiro Akiyama

The first Japanese person to go into space was Toyohiro Akiyama. On December 2, 1990, he traveled to space aboard the Soviet Union’s Soyuz TM-11 and stayed on the Mir space station. A former journalist, he became the first astronaut to make his mark in Japan’s space development history, and his flight remains a significant milestone to this day.

88 pieces

There are currently 88 constellations officially recognized by the International Astronomical Union (IAU). These constellations cover the entire sky and are imaginary patterns or shapes that exist on the celestial sphere. They play an essential role in astronomical positioning and the observation of celestial objects.