frank drake

500 billion planets in the Milky Way and also many planets in one hundred million other galaxies. In that huge number, it's hard to say that human beings are the only intellectual

According to National Geographic, two Voyager spacecraft launched by NASA in the late 1970s. These two spacecraft reach the farthest distance Earth ever.

The planets that are close enough to the stars for liquid water to exist are potential candidates that can nourish life.

If the truth outside the universe exists in countless different life forms as many people still believe, why can't we contact them?

Astronomers from around the world simultaneously point radio telescopes towards stars to look for signs of other civilizations in the universe.