Is life is existing in other planets in any other galaxies?
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Answer:
we do not exactly know about it but they find traces and are researching now also.
Answer:
The ultimate goal of NASA's exoplanet program is to find unmistakable signs of current life on a planet beyond Earth. How soon that can happen depends on two unknowns: the prevalence of life in the galaxy and how lucky we get as we take those first, tentative, exploratory steps.
Our early planet finding missions, such as NASA’s Kepler and its extended incarnation, K2, or the coming James Webb Space Telescope, could yield bare bones evidence of the potentially habitable worlds. James Webb, designed in part to investigate gas giants and super Earths, might find an outsized version of our planet. With a possible launch in the mid 2020s, WFIRST, or the Wide-Field Infrared Survey Telescope, could zero in on a distant planet’s reflected light to detect the signatures of oxygen, water vapor, or some other powerful indication of possible life.
But unless we get lucky, the search for signs of life could take decades. Discovering another blue-white marble hidden in the star field, like a sand grain on the beach, will probably require an even larger imaging telescope. Designs are already underway for that next-generation planet finder, to be sent aloft in the 2030s or 2040s.
Sara Seager looks into the camera.
MIT astronomer Sara Seager, is a McArthur Genius Fellow and leader in the scientific race to find another Earth in the near future.
MIT physics professor Sara Seager looks for possible chemical combinations that could signal the presence of alien life. She and her biochemistry colleagues first focused on the six main elements associated with life on Earth: carbon, nitrogen, oxygen, phosphorous, sulfur and hydrogen.
“We’re going to have so few planets, we have to get lucky,” Seager said. “I don’t want to miss anything. I don’t want to miss it because we weren’t smart enough to think of some molecule.”
To find out how about the advanced, space-based telescope technology being developed at NASA to search for life among the stars, read Inventing the Future.
The Search for Life
When we find life, how will we know? When we analyze light shot by a star through the atmosphere of a distant planet—a technique known as spectroscopy—the effect looks like a bar code. The slices missing from the light spectrum tell us which chemicals or gases are present in the alien atmosphere. One pattern of black gaps might indicate methane, another, oxygen. Seeing those together could be a strong argument for the presence of life. Or we might read a bar code that shows the burning of hydrocarbons; in other words, smog. Even without listening in on their conversations, the aliens’ reasonably advanced technology would be known to us by its pollution.