IFLScience
shared a link post in group #IFLScience
www.iflscience.com
What Are Gravity Assists And Why Do Spacecraft Use Them So Much?
Sometimes in space you have to go backwards to go forwards.
Comment here to discuss with all recipients or tap a user's profile image to discuss privately.
Embed post to a webpage :
<div data-postid="zawbmqv" [...] </div>