Milky Way

100 billion Planets around us! Caltech-led astronomers now estimate that at least 100 billion planets populate the our Milky Way.   Image © Luc Perrot; Luc’s Web site

New telescopes has spotted already thousands new worlds. Some of are them confirmed, some unconfirmed and some living in their system’s “habitable zone.”



All these new discoveries of exoplanets, allows astronomers to conclude how many worlds there are in our Galaxy.

The most recent answer: on the order of 100 billion, or one for every star in the Milky Way.

John Johnson, assistant professor of planetary astronomy at Caltec, said:

“There’s at least 100 billion planets in the galaxy—just our galaxy, that’s mind-boggling.”



source Eurekalert