❓ why
Why do some exoplanets orbit much closer to their stars than Mercury does to the Sun?
Quick Answer
Planet formation and later migration can move worlds inward, creating “hot Jupiters” and tightly packed systems.
The Full Story
Many exoplanets are found in orbits far smaller than Mercury’s 88-day path around the Sun. Planetary systems form in disks of gas and dust, but interactions with the disk or with other planets can cause migration, shifting a planet inward or outward after it forms. The first hot Jupiter, 51 Pegasi b, was announced in 1995 by Michel Mayor and Didier Queloz. Discoveries from missions like Kepler showed that compact planetary systems are common across the galaxy.
Key Facts
1.51 Pegasi b was announced in 1995
2.Mercury’s orbital period is 88 days
3.Planet migration can move worlds after formation
YouTube Angle
Suggested video title for this topic:
"Some alien planets are packed in ridiculously close to their stars."
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