Suppose a new comet, far beyond the planets of our Solar System, is discovered...

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YoBaby

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...to be 210 billion kilometers...? from Earth. How many light years from the Sun would this be?

And one more question:

Anatomically modern humans (Homo sapiens) have lived on this planet for perhaps as long as 200,000 years. What fraction of the age of the Earth is this?

a. roughly 4.3 percent of the Earth's total age
b. roughly 2.3 percent of the Earth's total age
c. roughly 0.15 percent of the Earth's total age
d. roughly 44 millionths of Earth's total age
e. roughly 15 millionths of the Earth's total age

Thanks!
 
Hi. First question, 300,000 km per second so just divide 210,000,000,000 by 300,000, or 700,000 for the time in seconds. Earth is about 4.5 or so billion years old. 4,500,000,000 divided by 200,000. So 1/22,500 of the Earth's age. Or 4.44444444 × 10^-5. Looks like D to me!
 
That distance is under a light year.
The comet would be to small to be spotted at that distance.

Your other question: How about answer D.
 
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