Linked Questions

23 votes
4 answers
2k views

Karman line analog on other celestial bodies

Is there a common definition of where the space begins on other planets (and other celestial bodies)? An equivalent of the Karman line. How far one should go from the martian surface to get to the ...
user avatar
4 votes
3 answers
1k views

When do aircraft become solarcraft?

Any body travelling through particles undergoes drag. Any body able to generate lift (for instance spheres cannot generate lift) can generate lift if it undergoes drag. First by assuming one body in ...
user avatar
11 votes
1 answer
761 views

What did Karman's original "Karman line" calculations look like?

Looking for the atmospheric parameters (density for example) and vehicle parameters (CL for example) as well as formulae that were used in the original calculation. Primary sources strongly preferred,...
Organic Marble's user avatar
11 votes
1 answer
588 views

Did the crew of Soyuz MS-10 pass the Karman Line?

Just wondering if Nick Hague got his gold astronaut wings.
Organic Marble's user avatar
17 votes
1 answer
1k views

Have spacecraft ever dipped below the Karman line and then safely continued spaceflight?

The item in Science Alert's A Harvard Astrophysicist Says Outer Space Is Actually Closer Than We Think (see also Science; Outer space may have just gotten a bit closer) talks about the recent Acta ...
uhoh's user avatar
  • 149k
2 votes
1 answer
804 views

Temperature and Pressure Gradient across Kármán line

Has there been any experimental measurement of the temperature and pressure gradient across the Kármán line? How much time did it take for a space shuttle (such as Atlantis) to cross it, and whether ...
Suddhasattwa Ghosh 's user avatar
1 vote
2 answers
300 views

Does Jonathan McDowell access U.S. military tracking network data? If so, how? Is a security clearance involved? (Can I too?)

NPR's news item and audio podcast New Chinese Space Plane Landed At Mysterious Air Base, Evidence Suggests draws heavily from information and quotes from noted astronomer with the Harvard-Smithsonian ...
uhoh's user avatar
  • 149k
7 votes
1 answer
331 views

With a 10% increase in Earth's mass, would the Karman line move up or down, and by how much?

This is an exercise to better understand the basic physics and math behind scale height and the Karman line. It was inspired by this answer to Why is FAI considering lowering the Karman Line to 80km? (...
uhoh's user avatar
  • 149k
3 votes
1 answer
312 views

When is/will be the symposium to revisit the Karman line and consider the "McDowell line"?

In the January 16, 2019 Sixty Symbols video Where is the edge of space? Dr Meghan Gray from the University of Nottingham discusses Jonathan McDowell's paper The edge of space: Revisiting the Karman ...
uhoh's user avatar
  • 149k
5 votes
1 answer
278 views

What factors would contribute to a spacecraft's ability to maintain a very low orbit (VLEO) or at least orbits with very low perigees?

I asked What does account for a high coffin corner of a plane? in Aviation SE. Now I wonder what factors would contribute to a spacecraft being able to maintain low circular orbits (e.g. within 200 km ...
user avatar
5 votes
1 answer
222 views

Is there a standard 'low orbit' for other solar system bodies?

Is there a standard or convention for what 'counts' as a low orbit for other solar system bodies? I'm currently writing code for computing arbitrary Hohmann/ patched conics transfers, and I am looking ...
Ingolifs's user avatar
  • 6,458
5 votes
1 answer
289 views

Are satellites whose orbits go below 100 km perigee considered having multiple spaceflights?

The International Aviation Federation (FAI) considers the space border at 100 km (330,000 ft) above sea level. So if an orbiting body goes below that altitude and continues its orbit without ...
Giovanni's user avatar
4 votes
1 answer
155 views

Was there a spacecraft that was clearly the first to be put in a polar orbit?

Was there a first spacecraft put in a polar orbit? It might not be clear if it's too hard to say what high inclination orbit is or is not polar, for example if 91 satellites were launched in 0, 1, 2.....
uhoh's user avatar
  • 149k
-4 votes
1 answer
151 views

Is it correct to apply the vis-viva equation to an airplane that flies in a straight line at the Kármán line?

The vis-viva equation models the motion of an orbiting body and it applies when the only force acting on the body is it's own weight. So is it correct to apply this equation to an airplane that ...
Cornelis's user avatar
  • 7,535
1 vote
1 answer
181 views

Does the recently-tested Russian hypersonic craft enter space?

I am not going to invoke the K-word in this question! Hypersonic long-range craft have to fly pretty high to travel circa mach 20. Would they need to travel into space to do so efficiently?
uhoh's user avatar
  • 149k

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