How many light years away is the sun
- how far is a light year away
- how many miles is a light year away
- how far is one light year away from earth
- how far is 1 light year away from earth
1 light-year in years...
1 light year in daysWhat Is a Light-year?
So what exactly are light-years — or rather, how far is one light-year? Light travels at 186,000 miles per second (300,000 kilometers per second). Therefore, a light second is 186,000 miles (300,000 kilometers).
A light-year is the distance that light travels in a year, or:
186,000 miles/second * 60 seconds/minute * 60 minutes/hour * 24 hours/day * 365 days/year = 5,865,696,000,000 miles/year
One light-year is 5,865,696,000,000 miles (9,460,800,000,000 kilometers).
One light-year is equal to km
Light-years are a long way!
Using a light-year as a distance measurement has another advantage — it helps you determine age. Let's say that a star is 1 million light-years away. The light from that star has traveled at the speed of light to reach our planet.
Therefore, it has taken the star's light 1 million years to get to our planet, and the light we are seeing was created 1 million years ago. So the star we are seeing is really how the star looked a million years ago, not how it looks at this moment from our viewpoint.
In the same way, our sun is 8 or so light minutes away.
If the sun were
- how far is one light year away in miles
- how far away is a light year in km