Skip to main content
J.D. Ray's user avatar
J.D. Ray's user avatar
J.D. Ray's user avatar
J.D. Ray
  • Member for 9 years, 1 month
  • Last seen more than a week ago
  • Portland, Oregon
30 votes
4 answers
5k views

What happens when one planet "lands" on another?

17 votes
14 answers
10k views

A billion dead?

15 votes
6 answers
2k views

What components make up a universal system of measurement?

12 votes
4 answers
2k views

Metal foam for stopping meteorites?

8 votes
4 answers
223 views

Laser-boosted Solar Sails to 61 Virginis?

7 votes
3 answers
3k views

Will moons orbiting gas giants always be tidally locked?

6 votes
3 answers
164 views

Calculating position without key resources

5 votes
2 answers
213 views

61 Virginis Mission Design: Ship Mass

5 votes
2 answers
364 views

61 Virginis Mission Design: Long Term High Gee Acceleration and the Human Body

5 votes
3 answers
1k views

Would a water-bearing, Earth-sized moon orbiting a gas giant have tides?

4 votes
2 answers
2k views

At 1.5 g of constant acceleration, how long does it take to get to 0.93c?

3 votes
4 answers
969 views

Modern facilities with medieval technology?

2 votes
1 answer
273 views

61 Virginis Mission Design: Solar System-sized Rail Gun for Ship Acceleration?

2 votes
2 answers
131 views

Maintaining assets during time jumps

2 votes
3 answers
82 views

Chemical propulsion for first stage of a light sail deployment?