❓ why
Why are some exoplanets found by transit surveys rather than direct images?
Quick Answer
A planet is vastly dimmer than its star and usually too close to it to see separately. Transit surveys detect the tiny dip in starlight when a planet passes in front of its star.
The Full Story
Directly imaging an exoplanet is difficult because the glare from the host star overwhelms the faint light of the planet. Transit surveys look instead for periodic drops in brightness, which can reveal a planet crossing the star’s face. This method has discovered thousands of exoplanets, especially through missions like Kepler and TESS. It is especially effective for planets whose orbits are aligned edge-on from our point of view.
Key Facts
1.Kepler launched in 2009
2.TESS launched in 2018
3.Thousands of exoplanets have been found by transit surveys
YouTube Angle
Suggested video title for this topic:
"How do we find planets we can’t even see?"
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