A light-year is the distance light travels in one year. It's 9.5 trillion (9,500,000,000,000) kilometers.とは 意味・読み方・使い方

A light-year is the distance light travels in one year. It's 9.5 trillion (9,500,000,000,000) kilometers.

It is an ultracool red dwarf star and has a mass only one tenth that of the Sun.

either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length

a theoretical sun that moves along the celestial equator at a constant speed and completes its annual course in the same amount of time the real sun takes at variable speeds

the distance that light travels in a vacuum in 1 year

The new planet follows a highly elongated path and takes 10,000 to 20,000 Earth years to orbit the sun.

Taking images of exoplanets is very difficult because they appear very faint next to the brightness of nearby stars.

Based on this data, the group estimates the sun's radius to be 696,010 kilometers with an error of plus or minus 20 kilometers.

Dr. Brown says the new planet is about one and a half times the size of Pluto and is big enough to be called the 10th planet.

According to Caltech's Assistant Professor Konstantin Batygin and Professor Mike Brown, the planet has a mass about 10 times that of Earth.

a program of rocket-powered flights undertaken by US between 1961 and 1963 with the goal of putting a man in orbit around the earth

Then it will gradually descend during the next 20 to 30 years and finally burn up after it enters the atmosphere.

The planet orbits Proxima Centauri, a star only about four light years away from Earth.

The Japan Aerospace Exploration Agency (JAXA) hopes to learn about the origins of the moon 4.5 billion years ago and the course of its evolution.

The birth of the solar system is estimated to have occurred about 4.6 billion years ago and included the formation of the sun, planets, moons and asteroids.

Professor Miyajima Kazuhiko of Doshisha University analyzed the digital photos and found that almost all of the stars were six millimeters in diameter but four were nine millimeters.

an imaginary sphere with an infinite radius for deciding the false angle and direction of a heavenly body from a point of observation

The U.S. National Aeronautics and Space Administration (NASA) recently announced that in 2016 it would launch an unmanned space probe called OSIRIS-REx (Origins-Spectral Interpretation-Resource Identification-Security-Regolith Explorer).

Toward the end of the 16th century a new star came into existence in the sky, which taught the people that even the stellar universe was mutable.

Images taken by NASA's Mars Reconnaissance Orbiter show dark, narrow streaks flowing downhill on Mars.

Among over 400 planets that have been found outside the solar system, this one is considered to have a particularly strong chance of being habitable.

According to the new definition, a planet is a celestial body that (1) is in orbit around the Sun, (2) is heavy enough to maintain a round shape by self-gravity, and (3) has cleared the neighborhood around its orbit.

The artificial satellite is in an elliptical orbit 65 miles above the earth at perigee and 200 miles at apogee.

The Japan Aerospace Exploration Agency (JAXA) will use the satellite to carry out verification tests on next-generation solar cells.

United States astronomer (born in the Netherlands) who studied the solar system and suggested in 1951 that there is a belt of comet-like debris at the edge of the solar system (1905-1973)

The technology is essential in realizing longer manned space journeys, such as missions to Mars.

an artificial satellite that generates solar power in orbit and transmits the power to the earth by radio waves

the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago)

German mathematician and astronomer who made accurate measurements of stellar distances and who predicted the existence on an 8th planet (1784-1846)

If the particles are in fact from beyond our solar system, they could help us learn more about the origins of our solar system and perhaps of life itself.