Which piece of evidence supports the idea that a star's distance from Earth must be known to determine its true brightness?
*
1 point
A) Deneb is 100,000 times brighter than the sun.
(B) Orion's two brightest stars are Betelgeuse and Rigel.
(C) Larger stars will burn up their energy faster, which means their lives will be shorter.
(D) If Deneb was the same distance from Earth as Vega, it would outshine all other stars.

After much observation, scientists discovered the way stars appear to us depends on more than their actual size—it’s also about how far they are from us. Therefore, the farther a star is from Earth, the smaller it will appear to us. The closer it is, the bigger it will look.

That’s because the sun is closest to us compared to all other stars, located at just a short 150 million kilometers from Earth.

Many people answer Alpha Centauri, but some don’t know that it’s actually a cluster of three stars—Alpha Centauri A, Alpha Centauri B, and Proxima Centauri. Proxima Centauri is 4.24 light-years away and closest to our sun. A light-year is the distance that light travels in one year. We use this measurement because light is the only thing in the universe that maintains a constant speed.

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