⚙️ how
How do astronomers find planets around other stars?
SpaceExoplanets
Quick Answer
They use methods such as transits and radial velocity to detect a planet’s effect on its star. The transit method has found thousands of exoplanets.
The Full Story
The transit method looks for tiny dips in starlight when a planet crosses in front of its star, while radial velocity detects the star’s wobble caused by the planet’s gravity. NASA’s Kepler mission, launched in 2009, used transits to revolutionize the field and discovered thousands of candidates. Other methods include direct imaging, microlensing, and timing variations in pulsars or eclipsing systems. Together, these techniques have revealed that planets are common in the Milky Way.
Key Facts
1.Kepler launched in 2009
2.A transit causes a small, periodic drop in brightness
3.Direct imaging is difficult because stars are much brighter than planets
YouTube Angle
Suggested video title for this topic:
"How we find worlds we can’t see directly"