Why Is It Better to Search for Extrasolar Planets Directly

Multiple Choice

Why is it better to search for extrasolar planets directly using infrared (IR) rather than visible radiation?

A) the planet doesn't reflect any visible radiation, only IR radiation
B) the star doesn't emit any IR radiation because it is too hot
C) the visible light from planets will be blocked by interstellar dust along our line of sight while the IR radiation will not
D) the planet emits more IR radiation than it reflects in the visible