銀河系の大きさは、横断するのに少なくとも千光年か百万光年かかるだろう。の英語

The size of a galaxy may be as little as a thousand light-years across or as much as a million light-years across.

a cluster of a million to ten million fixed stars in space, which has a diameter of about 100 light years

a group of several thousand fixed stars in space that have a diameter of about ten light years

An irregular galaxy has an undefined shape and is full of young stars, dust, and gas.

There are many small stars like Gliese 667C in our galaxy.

A few trillion years into the future, star formation may already end.

There are many, many planets in the Milky Way which are just as big as Jupiter.

`extragalactic nebula' is a former name for `galaxy'

It will be possible to predict a few years beforehand whether an asteroid will collide with the earth or not.

The Magellanic Clouds are about 200,000 light‐years away from our galactic system.

of or relating to a galaxy (especially our galaxy the Milky Way)

The meteorite may have hit Mars several billion years ago.

A galaxy is a cluster of stars, dust, and gas which is held together by gravity.

the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth

The Andromeda Galaxy is my home.

The Crab Nebula is about 7,200 light years from Earth.

a unit of distance used in astronomy, called light-year

Saturn's rings are composed of thousands of ringlets.

However, many other celestial bodies of similar or larger size have been found in the solar system.

a star that is too small to be a fixed star and too big to be a planet

On the surface of the moon and Mars there are countless craters, both big and small.

Astronomers inferred the existence of a local supercluster.

Stars appear to have different colors like blue and red according to their size and age.

This magnetar is located about 50,000 light years away from the earth.

The star is located 20 light years away from Earth in the constellation Libra.

a massive grouping of galaxies in the direction of Centaurus and Hydra whose gravitational attraction is believed to cause deviations in the paths of other galaxies

supergiant star 650 light years from Earth

There are millions of stars in the universe.

The satellite will separate from the rocket and orbit the earth at 600 to 800 kilometers above the ground for approximately three years.

Seen through a telescope, the planets take on a completely new appearance.