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f the Triangulum Galaxy is 940 kiloparsecs away, how long does it take for light to reach our telescopes here on Earth? *Be sure you understand metric prefixes and math here! a) About 3.1 million years. b) About 940,000 years. c) A little over 3,000 years. d) About 3.1 billion years.

Answer :

Final answer:

The light from the Triangulum Galaxy, which is 3.1 million light years away, journeys through intergalactic space for about 3.1 million years before it reaches our telescopes on Earth. Thus, when we observe this light, we are essentially looking back in time.

Explanation:

The light from the Triangulum Galaxy takes about 3.1 million years to reach our telescopes here on Earth. Hence, the correct answer is a) About 3.1 million years.

To better visualize the distances involved in intergalactic space, imagine light covering almost 10,000,000,000,000 kilometers in one year. This means that a string one light-year long could wrap around the Earth about 236 million times. When we look at distant galaxies like Triangulum, the light we see started its journey millions of years ago. As such, astronomers can in effect use these observations as a 'cosmic time machine' to study how distant galaxies formed and evolved over long periods of time.

Learn more about Triangulum Galaxy and light travel to Earth here:

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