Question

Why is life not possible on venus and mars?

Answer 1

Hint: The first cells appeared approximately 3.5 billion years ago on Earth. While biologists still argue about exactly how this happened, there are no disputes about the three fundamental requirements for life on Earth. Life Requires All:
1.Liquid water
2.Vital chemicals
3.The Source of Energy

Complete answer:
1.Due to its proximity and similarities to Earth, the possibility of life on Venus is a topic of interest in astrobiology. No definitive evidence of past or present life on Venus has been found to date.
2.Since the early 1960s, when spacecraft began studying the planet, theories have decreased significantly and it became clear that its climate is extreme compared to Earth's.
3.There is ongoing research on whether life on the surface of Venus may have occurred until a runaway greenhouse effect took hold, and related research on whether a relict biosphere could survive high in Venus's modern atmosphere.
4.The Martian surface was apparently quite habitable four billion years ago, with rivers, lakes and even a deep ocean.
5.Some astrobiologists also see ancient Mars as an even better cradle of life than Earth was and claim that long ago, life on our planet may have come here aboard Martian rocks blasted by a powerful space impact.
6.When Mars lost its global magnetic field, things changed. Magnetic fields that streamed from the sun were then free to strip the once-thick Martian atmosphere and strip it away.
7.By about 3.7 billion years ago, observations by NASA's MAVEN orbiter suggest that this process had turned Mars into the cold dry world we know today. (The world's magnetic field is still on Earth, explaining how our planet remains so livable.)
8.This turn of events, however, does not necessarily mean that Mars today is a dead planet.

Note: Venus is the Sun's second planet and after the Sun and the Moon, the third brightest object in the Earth's sky. Because their size and mass are so similar, it is sometimes referred to as the sister planet to Earth. Mars is the sun's fourth planet. Possessing the bloody colour of the Red Planet, the Romans named it after their god of war.