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) examining spectral lines from the atmospheres of distant planets
B) sending spacecraft to study the planets up close
C) examining high-resolution images of the planets made by orbiting telescopes
D) determining the orbital properties of the planets

Question

Quizplus · Accepted Answer

Examining spectral lines from the atmospheres of distant planets can give insight into the chemical composition of the planet's atmosphere, which can reveal the presence of life. For example, the presence of oxygen in an atmosphere could be a strong indicator of life as we know it, as it is produced by photosynthesis.

We Are Not Yet Capable of Detecting Life on Planets