We are not yet capable of detecting life on planets around other stars. But as our technology develops, our first real chance of detecting such life will probably come from .
A)sending spacecraft to study the planets up close
B)determining the orbital properties of the planets
C)examining spectral lines from the atmospheres of distant planets
D)examining high- resolution images of the planets made by orbiting telescopes

Question

Quizplus · Accepted Answer

Examining spectral lines from the atmospheres of distant planets will allow us to detect the presence of certain gases, such as oxygen or methane, which are strong indicators of life. This technique is already being used to study the atmospheres of exoplanets, and as our telescopes become more advanced, we will be able to detect smaller and smaller amounts of these gases, increasing our chances of finding signs of life. Sending spacecraft or examining high-resolution images could also provide valuable information, but they would require much more time and resources than simply studying spectra. Determining the orbital properties of planets is important for identifying potentially habitable environments, but on its own, it is not enough to detect life.

We Are Not Yet Capable of Detecting Life on Planets