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Light from the farthest regions of the universe takes billions of years to reach Earth, prompting scientists to consider the implications of potential alien contact.
Earth is almost 8,000 miles in diameter and moves at approximately 66,000 mph around the Sun, which is about 93 million miles away.
A beam of light takes one year to travel 10 trillion kilometers, illustrating the vast distances in interstellar space.
NASA's Kepler spacecraft is capable of detecting Earth-like planets, paving the way for future telescopes to analyze their atmospheres for signs of life.
200 billion stars exist in our galaxy, with one in five potentially hosting Earth-like planets, according to astronomer Lisa Kaltenegger.
