A Light-Year is a measure of DISTANCE, not TIME. A light-year is how far light can travel in one year.
Light travels at 186,000 miles per second, or a little faster than 11 million miles per minute. In metric terms, the speed of light is a tad less than 300,000 km/sec.
1 light year is approximately 5.9 trillion miles, 20.5 light years would therefore be 20.5 times 5.9 trillion miles or about 120 trillion miles. traveling at 100,000 mph it would take about 137,000 years to travel the distance.
A lightyear is the distance light travels in a year, rather than a time. A lightyear is approximately equal to 9.46x10^15 meters, or 5.88x10^12 miles.
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1 Saturn year is equal to 29 earth years.
It is approx 0.000015 light years.
29.5 earth years
Zeta Reticuli is approximately 39 lightyears away, it takes about 234 years to reach the system.
One light year is equivalent to about 5,878,400,000,000 miles on earth.
Mercury Is 0.000131 lightyears away from earth
It is around 640 lightyears away.
The nearest star to Earth is the sun, at a distance of 0.000016 light years from Earth. The next nearest star, Proxima Centauri, is about 4.2 light years away.
The moon is about 0.0000000406 light years away from earth. Clearly, the moon is MUCH too close (238,000 or 239,000 miles or so) for the distance to be rendered meaningfully in light years.
1 Saturn year is equal to 29 earth years.
87 earth years
It is approx 0.000015 light years.
29.5 earth years
Its way less than 1 lightyear, so it's not counted in lightyears. Its about 3 light minutes depending on orbit
I can't give you the answer in kilometres, but Wolf 359 is 7.78 lightyears from Earth
1,000,000,000 light-years (one billion light-years) are in one Gly
Estimated at about 2.5 million light-years.