Hunting for life on other worlds isn’t easy.
Have you ever played hide-and-seek in a new place? It’s much harder than playing at home. You only know the obvious hiding spots: under the bed, in the closet, behind the couch. The trick is trying to think of hiding spots you can’t even imagine. How do you search in places you never thought could be hiding spots?do when we look for alien life; we’re trying to think of new ways to look for life.
To do that, the lander scooped up some dirt, shined a light on it and made measurements to see if any of the carbon dioxide in the air was transferred into the dirt. This experiment did not show any signs of photosynthesis in Mars’ dirt. The Viking lander experiments were the most direct tests for life on other planets. In terms of a game of hide-and-seek, though, these experiments were basically like looking in the closet: It’s a pretty obvious hiding spot, but you should check there just in case. Even so, it took scientists a long time to interpret the results.
We’ve learned, though, that there are other ways to make oxygen that don’t involve life. So now, astronomers don’t look for just oxygen – instead they’re on the hunt for a planet that has oxygen along with water and other gases, like methane and carbon dioxide. Together, these combinations might indicate life because we don’t think planets without life would have them.
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