Author Marianne Dyson's
May 2018 Science Snacks Newsletter

Slowing Down from Space
Many people mistakenly think that there is no gravity in space, and thus all that’s needed to reach space is to attain a certain altitude. But this is NOT true! Earth’s gravity at the surface is defined as 1g. A simple calculation* shows that the gravity at 200 miles (320 km) altitude is 90 percent of what it is on the surface, or 0.9g.

The reason spacecraft stay in orbit is not because there isn’t any gravity, but because they have attained the speed necessary to balance gravity’s pull. They must go up high enough to avoid running into mountains and the upper atmosphere which would slow them down.

Read more:

Note to subscribers: MailChimp has gotten so time consuming to use that all future Science Snacks will be sent out with a few paragraphs introduction and a link to the entire blog and images on WordPress. You can always read my current and past blogs by clicking on the Science Snacks Blog tab on my website, Thank you for letting me share my passion for space with you!
Copyright © *|2018|* *|Marianne Dyson|*, All rights reserved.


Want to change how you receive these emails?
You can update your preferences or unsubscribe from this list.

This email was sent to <<Email Address>>
why did I get this?    unsubscribe from this list    update subscription preferences
Author Marianne Dyson · 15443 Runswick Drive · Houston, TX 77062 · USA

Email Marketing Powered by Mailchimp