Why Alien Civilisations Would Struggle to Detect Our Planet Using Current Planet-Hunting Methods

Why can't we detect an Earth-like planet around a Sun-like star, and would alien civilisations searching for us face the exact same obstacle? (Credit: By NASA - Nancy Grace Roman Space Telescope Illustrations, Public Domain/Wikimedia Commons)

Astronomers do not yet have a reliable, routine way to detect and confirm an Earth-size, Earth-mass planet in an Earth-like orbit around a Sun-like star using current planet-hunting methods.

The challenge is not that such a detection is physically impossible, but that the planet's faint signal must be separated from stellar activity, instrumental noise and the overwhelming brightness of its star.