What would happen if you tried to hit a baseball pitched at 90% the speed of light? How much physical space does the Internet take up?

Randall Munroe, the author of xkcd comics, answers these questions and other bizarre queries in his new book What If?: Serious Scientific Answers to Absurd Hypothetical Questions — the next official selection for the MashableReads social book club. Munroe uses math and his characteristic stick figure comics to provide serious scientific answers to absurd hypothetical questions.

So, inspired by What If?, we want to see your web comics. Draw us a one panel comic showing us an alternate version of history. Or, if you are feeling particularly creative, illustrate your own absurd hypothetical situation.

If you're looking for inspiration, Munroe has some pointers:

Put the head at the top of the person and legs at the bottom...



...Unless the person is having a bad problem. Then maybe the legs are on the top.



Or inside a dinosaur.



You may destroy the world a maximum of once. Once you've destroyed it, it's not there anymore and you can't destroy it again.



There are other planets, though. Those are totally fair game.



Moons, too. There are lots of moons that I'm sure nobody would miss. Just saying. Best of luck! —Randall

Share your one panel comic on Instagram, Vine, Tumblr, and/or Twitter by 11:59 p.m. ET on Sept. 4 and be sure to tag your submission with the hashtag #whatifchallenge. We'll showcase our favorites on Mashable and Randall Munroe himself will select 5 comics as grand prize winners. Click here for official contest rules.

Happy drawing!

How to Join the MashableReads Social Book Club

If you'd like to join the MashableReads book club, find us on Goodreads and Facebook.

Are you in New York City? Join our Meetup group for the chance to meet MashableReads authors in person. Interested in starting your own Meetup in your community? Message us on Facebook. MashableReads book clubs get exclusive access to new authors.

BONUS: Authors in Conversation with MashableReads

Image: Excerpted from What If?: Serious Scientific Answers to Absurd Hypothetical Questions by Randall Munroe to be published by Houghton Mifflin Harcourt on September 2nd, 2014. Copyright © 2014 by xkcd Inc. Used by permission of the author. All rights reserved.