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A light-year is a unit of distance. It is the distance that light can travel in one year. Light

moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can

travel about 10 trillion km. More p recisely, one light-year is equal to 9,500,000,000,000

kilometers or about 5,878,630,000,000 miles.... So, this distance is 1 light-year. ...

moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can

travel about 10 trillion km. More p recisely, one light-year is equal to 9,500,000,000,000

kilometers or about 5,878,630,000,000 miles.... So, this distance is 1 light-year. ...

The fastest thing that we know of is light which travels at a speed of 186,000 miles or 300,000

kilometers per second in empty space. To get an idea of how fast this is, light can travel about seven

times around Earth in one second! Astronomer use the speed of light to measure how far away things

are in space. They use a unit called the light-year. A light-year (ly) is the distance that light can travel in

one year. In one year light travels about 5,880,000,000,000 miles or 9,460,000,000,000 kilometers. So,

this distance is 1 light-year. For example, the nearest star to us is about 4.3 light-years away. Our

galaxy, the Milky Way, is about 150,000 light-years across, and the nearest large galaxy, Andromeda, is

2.3 million light-years away.

kilometers per second in empty space. To get an idea of how fast this is, light can travel about seven

times around Earth in one second! Astronomer use the speed of light to measure how far away things

are in space. They use a unit called the light-year. A light-year (ly) is the distance that light can travel in

one year. In one year light travels about 5,880,000,000,000 miles or 9,460,000,000,000 kilometers. So,

this distance is 1 light-year. For example, the nearest star to us is about 4.3 light-years away. Our

galaxy, the Milky Way, is about 150,000 light-years across, and the nearest large galaxy, Andromeda, is

2.3 million light-years away.