Exoplanet spin measured for first time

Eight-hour day on Beta Pictoris b is shorter than day of any planet in our solar system

AS THE WORLD TURNS  On Beta Pictoris b (upper right, in an artist’s illustration), a day is just over eight hours long. The exoplanet spins almost twice as fast as Jupiter does (when measured at the equator). The exoplanet’s spin continues a trend seen in our solar system: More massive planets spin faster. 

I. Snellen/Leiden Observatory, adapted by S. Egts

This article is only available to Science News subscribers.

Subscribers, enter your e-mail address to access our archives.

Not a subscriber?

Science News is a nonprofit.

Support us by subscribing now.

More Stories from Science News on Astronomy

From the Nature Index

Paid Content