User djr

17 votes

Do companies/governments ever sell satellites that are already in space?

answered Jan 21, 2017 at 22:37

14 votes

Puzzler - which spacecraft(s) incorporated real wood structural elements?

answered Oct 30, 2016 at 18:34

13 votes

What would one need to do to get an amateur satellite into orbit?

answered Dec 9, 2017 at 21:21

9 votes

Accepted

Is HAN-water propellant "green" enough to ever be used in a cubesat?

answered Oct 30, 2016 at 17:52

8 votes

Is it true that hydrogen is the only practical fuel for upper stages?

answered Jul 12, 2018 at 21:23

7 votes

Accepted

Why Never-EVER Land?

answered Mar 22, 2018 at 20:34

6 votes

Accepted

Missions at or soon-to-be at Mars and their DSN "codenames"?

answered Mar 8, 2018 at 13:55

6 votes

Why not build rockets out of composite materials?

answered Dec 28, 2015 at 18:44

6 votes

Accepted

What is the minimum number of RCS thrusters capable of stabilizing a satellite against an arbitrary rotation?

answered Mar 11, 2016 at 23:24

6 votes

Why don't unmanned launch vehicles include launch escape system for payload?

answered Dec 26, 2021 at 17:11

5 votes

If I wanted to try to terraform Mars, who would have the authority to stop me?

answered Oct 28, 2018 at 18:43

5 votes

Accepted

Has "parasitic radar" ever been used in space?

answered Dec 22, 2021 at 20:42

5 votes

How might the experience of a trip to Mars differ in comfort and heath impact from a stint on the ISS?

answered Mar 9, 2018 at 21:01

5 votes

Accepted

How fast is the onset of periodic eclipse for a spacecraft in LEO?

answered Mar 24, 2018 at 19:14

4 votes

If we were to land on Phobos, what could we gain?

answered Apr 2, 2018 at 22:07

4 votes

Radioisotope thermoelectric generator behavior on reentry

answered Nov 19, 2018 at 22:09

4 votes

Accepted

cross parachute - drag coefficient

answered Apr 18, 2022 at 22:31

3 votes

Accepted

At what Mars-time did Perseverance land?

answered Apr 22, 2022 at 21:11

3 votes

Why do New Shepard's drogue chutes just "hang there" for ten seconds before deploying the main parachutes? What happens during that time?

answered Dec 13, 2021 at 22:12

3 votes

What would be a few challenges to build a landing strip on mars?

answered Nov 22, 2016 at 22:54

3 votes

Accepted

Yikes! How did we miss 2017 VL2?

answered Dec 9, 2017 at 20:23

2 votes

Is a space probe communication relay possible?

answered Jun 5, 2017 at 20:43

2 votes

What if anything makes launching a recovered SpaceX rocket from a drone ship implausible?

answered Aug 7, 2018 at 22:35

1 vote

Accepted

Are these images from Planet Labs? Are the images publicly available?

answered Mar 21, 2018 at 23:21

1 vote

Why put SunRISE in the graveyard? Why will it "fly slightly above geosynchronous orbit"?

answered Oct 27, 2021 at 18:43

1 vote

Accepted

What is "trade space" in the context of libration orbit mission design? (used in trade analysis, launch window analysis and trade study)

answered Mar 7, 2022 at 21:50

Stack Exchange Network

26 Answers

Do companies/governments ever sell satellites that are already in space?

Puzzler - which spacecraft(s) incorporated real wood structural elements?

What would one need to do to get an amateur satellite into orbit?

Is HAN-water propellant "green" enough to ever be used in a cubesat?

Is it true that hydrogen is the only practical fuel for upper stages?

Why Never-EVER Land?

Missions at or soon-to-be at Mars and their DSN "codenames"?

Why not build rockets out of composite materials?

What is the minimum number of RCS thrusters capable of stabilizing a satellite against an arbitrary rotation?

Why don't unmanned launch vehicles include launch escape system for payload?

If I wanted to try to terraform Mars, who would have the authority to stop me?

Has "parasitic radar" ever been used in space?

How might the experience of a trip to Mars differ in comfort and heath impact from a stint on the ISS?

How fast is the onset of periodic eclipse for a spacecraft in LEO?

If we were to land on Phobos, what could we gain?

Radioisotope thermoelectric generator behavior on reentry

cross parachute - drag coefficient

At what Mars-time did Perseverance land?

Why do New Shepard's drogue chutes just "hang there" for ten seconds before deploying the main parachutes? What happens during that time?

What would be a few challenges to build a landing strip on mars?

Yikes! How did we miss 2017 VL2?

Is a space probe communication relay possible?

What if anything makes launching a recovered SpaceX rocket from a drone ship implausible?

Are these images from Planet Labs? Are the images publicly available?

Why put SunRISE in the graveyard? Why will it "fly slightly above geosynchronous orbit"?

What is "trade space" in the context of libration orbit mission design? (used in trade analysis, launch window analysis and trade study)