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hdhondt
  • Member for 5 years, 7 months
  • Last seen this week
  • Australia
50 votes
Accepted

Why tantalum for the Hayabusa bullets?

12 votes
Accepted

How about space ziplines

8 votes
Accepted

What is our ability to capture or reflect photons with a wavelength of $2.5×10^{-12}$ meters?

7 votes
Accepted

Was the launch of "Tianhe" a failure or success?

3 votes
Accepted

What is the state of the art of exosolar planet imaging in 2019?

3 votes

What can cause grooves (stairs like) features on Mars's ground that is opposite to water flow direction?

2 votes

How fast were the Lunar Command Module and Landing Module traveling around the Moon when they reconnected?

2 votes

Feasibility of a small mass driver?

1 vote

Drone Racing on moon

0 votes

Is centre of mass a factor in space without gravity?

-1 votes

Using asteroids as propellent source

-1 votes

in microgravity do you need fuel to continue same velocity?

-2 votes

At a height of 100 km, what speed do you need to be going to escape Earth's gravity?