Monthly Archives: February 2013

Gravity Tractor Doh

Posted on February 26, 2013 by johnhare

Due to the lasting nature of communicating on these various internet sites, I am on record in several places as saying that gravity tractors for moving asteroids are stupid. I could see no way that gravitational attraction between an asteroid … Continue reading →

Posted in Uncategorized | 15 Comments

Moving Regolith

Posted on February 24, 2013 by johnhare

  Quite often some form of bulldozer on the moon or Mars to dig ores or cover habitats is suggested. There seems to be a meme out there that the best way to move sandy gravely material is similar to … Continue reading →

Posted in Uncategorized | 17 Comments

Isogrid Spiral Welded Tanks

Posted on February 17, 2013 by johnhare

    After following a discussion on ARocket for the last few weeks, I had a thought on building propellant tanks that is mostly a combination of other peoples’ ideas. John Carmack made a good case for spiral welded propellant … Continue reading →

Posted in Uncategorized | 12 Comments

Random Thoughts: Asteroids and Money-Mouth Co-location

Posted on February 15, 2013 by Jonathan Goff

With yesterday’s meteorite impact in Russia, I’ve seen several clever tweets featuring this clever picture: But to me, meteor impacts today are nature’s way of asking “Have you thought about donating to the B612 Foundation’s Sentinel Mission lately?” Most serious … Continue reading →

Posted in NEOs | 5 Comments