CITATION — REFERENCE ENTRY
methods-explained · nobel2019popular
- Citation
- nobel2019popular
- Claim ID
- methods-explained
- Assertion
- The radial velocity method measures how a star moves under the pull of its orbiting planet: light from a star moving towards us is bluer, and redder when it moves away. The transit method measures the dip in a star's brightness when a planet passes in front of it. 51 Pegasi b orbits only about eight million kilometres from its star, taking four days per orbit.
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