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Is the universe 93 billion light-years?
Well, the observable universe is currently 93 billion light years across.
What galaxy is 800 million light-years away?
Hydra Cluster
The picture on the left shows an optical photograph of the Hydra Cluster of galaxies which is about 800 million light years from Earth. The optical image shows many individual galaxies, but that is only part of the story.
How long does it take light to travel 1 billion light-years?
about 37,200
Saying we were a space shuttle that travelled five miles per second, given that the speed of light travels at 186,282 miles per second, it would take about 37,200 human years to travel one light year.
Is a light year?
Light-year is the distance light travels in one year. Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year.
How long has light been traveling through the universe?
Imagine the Universe! Current observations suggest that the Universe is about 13.7 billion years old. We know that light takes time to travel, so that if we observe an object that is 13 billion light years away, then that light has been traveling towards us for 13 billion years.
How many light years can we see?
But 13.8 billion light years is far too small to be the right answer. In actuality, we can see for 46 billion light years in all directions, for a total diameter of 92 billion light years.
How far away can we see the universe?
If the Universe is 13.8 billion years old, and the speed of light is truly our cosmic speed limit, how far away should we be able to see? The answer seems obvious: 13.8 billion light-years, since a light-year is the distance light can travel in a year, and nothing can go faster than that.
How old is the universe?
You might think, in a Universe limited by the speed of light, that would be 13.8 billion light years: the age of the Universe multiplied by the speed of light. But 13.8 billion light years is far too small to be the right answer.