Astronomers Want to Find the Habitable Planet Where Alien First Life

Manusia bertemu alien. Mungkinkah?
Manusia bertemu alien. Mungkinkah?
Sumber :
  • SoundCloud

VIVA – Once life gains even the tiniest foothold on a planet, it may have the power to transform that world, forcing us to broaden our definition of “habitable” new research suggests. Currently, we don’t really know where life might arise. We have only one example of a life-hosting planet, Earth, which started to get interesting perhaps only a few hundred million years after it formed.

Life on Earth required a certain set of elements to perform its complex chain of energy production it needs liquid water as a solution, and it can exist only in a relatively narrow range of atmospheric temperatures and pressures.

In the search for life beyond Earth, astronomers generally focus on areas called habitable zones, orbital bands around stars where liquid water could potentially exist on a planet's surface. 

If a planet is closer to the star, water will evaporate from its heat. But if it's farther from the star, the water will freeze into ice. Neither of these conditions is good for life as we know it. But the habitable zone is only a rough guide, not a guarantee. Mars and Venus are within the Sun's habitable zone, but those planets are uninhabited. 



Photo :
  • Tech Explorist

Earth would be completely different if it weren't for life. The classic example is the abundant quantities of oxygen in our planet's atmosphere.

Oxygen is a very common element throughout the cosmos, and Earth was born with a lot of it. But most of that oxygen is bound up in the form of silicon dioxide rocks. Gaseous oxygen can't survive in the atmosphere long, because ultraviolet radiation from the sun breaks it apart.

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