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Chris B. Behrens's user avatar
Chris B. Behrens's user avatar
Chris B. Behrens's user avatar
Chris B. Behrens
  • Member for 9 years, 10 months
  • Last seen this week
16 votes
5 answers
5k views

Why is it even desirable for a spacecraft to land without a parachute?

11 votes
1 answer
2k views

What useful elements are NOT to be found on Mars?

11 votes
2 answers
1k views

Did the Apollo astronauts suffer any health effects from inhaling lunar regolith?

11 votes
5 answers
3k views

What processes create an object with an interstellar velocity?

10 votes
1 answer
1k views

What are the details of the SSTO Mars profile for the BFR?

10 votes
2 answers
3k views

What is the delta-v required to get a mass in Earth orbit into the sun using a SINGLE transfer?

10 votes
2 answers
315 views

How, in the SpaceX Mars stack, do they plan to address de novo landing sites?

10 votes
2 answers
1k views

How thick would a Marscrete structure need to be to provide adequate protection against radiation?

8 votes
2 answers
2k views

Why did the Falcon Heavy core engines fail to reignite?

8 votes
3 answers
7k views

Which theoretical propulsion system has the highest specific impulse?

7 votes
1 answer
1k views

What will the role of a pilot be on the SpaceX Starship?

7 votes
1 answer
2k views

Does the entirety of the efficiency of an aerospike engine occur in the lower atmosphere, or are the advantages in a vacuum as well?

7 votes
1 answer
861 views

What precisely was the character of the non-gravitational acceleration of Oumuamua?

7 votes
1 answer
440 views

How can a non-floored habitat be sealed on Mars?

6 votes
1 answer
91 views

What is the current state of knowledge regarding embryology (from an animal husbandry perspective) in Mars-g gravity?

6 votes
0 answers
75 views

What is the current state of Squeeze-suit development, as distinguished from gas-pressurized models? [duplicate]

4 votes
0 answers
191 views

What are the non-technical barriers to creating a practical nuclear propulsion system?

4 votes
0 answers
399 views

From a strictly engineering standpoint, would Venturestar have worked as an SSTO?

4 votes
1 answer
430 views

How much would it cost to replace the ISS if we started the effort in 2018?

3 votes
0 answers
141 views

What are the physical requirements of an astronaut for a Mars mission likely to be?

3 votes
1 answer
267 views

Is the behavior of the Bussard ramjet as described in Poul Anderson's novel Tau Zero accurate?

3 votes
1 answer
202 views

What series of devices would you need to deliver to the Martian surface to manufacture concrete entirely in-situ?

3 votes
0 answers
51 views

How applicable can Martian soil samples from a handful of sites be to Mars at large?

3 votes
1 answer
95 views

Can an orbital burn and a separate trans-injection burn be combined so that they are perfectly efficient?

3 votes
0 answers
102 views

What is the effect of a solar flare on electronics on the surface of Mars?

2 votes
0 answers
46 views

What is the orientation of ionizing radiation exposure in spaceflight?

2 votes
1 answer
176 views

What would be the minimum energy trajectory for an inbound intercept course for another body?

2 votes
2 answers
213 views

Is there a point where boosters don't make sense, or are boosters always desirable to increase payload?

1 vote
1 answer
711 views

How much propellant is needed for a 1G continuous trip to the moon?

1 vote
1 answer
123 views

What is known (or can be deduced with a high degree of certainty) about the distribution of uranium on Mars?