How long does it take light from some of the galaxies in the Local Group to reach earth?

Answer 1

A light-year is actually a measurement of distance, not time. A single light-year is the distance light travels in a vacuum in a one year period. The speed of light is approximately 186,000 miles per second. The nearest spiral galaxy to our own Milky Way Galaxy is the Andromeda Galaxy, which is approximately 2,500,000 light years away. This means that the light that reaches our eyes originated 2.5 million years ago. In essence, when we look at such distant objects, we are looking into the past.

Answer 2

That question doesn't make sense, it seems you may have misinterpreted someone else's answer to a similar question which is: 'how many miles are there in a light year?'.

The correct answer is approximately 587849981000000 miles or 5.8 trillion miles. When people say 6 trillion they're just rounding it up for brevity's sake.

To clarify: Astronomers and Astrophysicists use terms like light year, parsec, and megaparsec to represent extremely long distances, because using smaller units, like kilometers or miles, still has the problem of very large numbers. A light year is the distance a beam of light, traveling at 186,000 miles per second, would travel in one year. A parsec, without unduly complicating this answer, is 3.26 lightyears, and a megaparsec is 3.26 million lightyears.

Answer 3

The distance to the Black Eye Gaxaxy is estimated at 24 million light years (with an estimated error of 2 million light years); that means it will take approximately 24 million years for its light to reach us.

Answer 4

In very very rough, round, approximate numbers . . .

The diameter of our galaxy is about 100,000 light years, and we are located about

28,000 light years from its center.

So, depending on where on the edge the light originates, it would take anywhere

between 22,000 years and 78,000 years to reach the Earth.

Give or take a few hours . . .

Answer 5

30000 Years. A light year by definition is the distance light travels in one 'earth' year.

Answer 6

Light travels 300,000 km in one sec

x 60 sec in a min

x 60 min in an hour

x 24 hr in a day

x 356.25 days in a yr

x 3,000,000,000 years.

Answer 7

Varies between 25, 000 years for the closest to around 2.5 million years for Andromeda galaxy.

See related question for other galaxies.

Answer 8

The Andromeda galaxy,2.9 million light years away from us

Answer 9

6 trillion miles = 1.02066857 light years.

Answer 10

According to today's best estimates of the size of our galaxy,

that would be somewhere between 100,000 and 200,000 years.