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9 votes

Why does the Falcon 9 first stage perform a burn at 60 km altitude?

WARNING: I will use a lot of simplifications, metaphors, and analogies. If you are a physicist, rocket scientist, or aerodynamicist, please skip this answer :-D This is called supersonic ...
Jörg W Mittag's user avatar
7 votes
Accepted

Why does the Falcon 9 first stage perform a burn at 60 km altitude?

A returning Falcon 9 first stage will perform at least 2 of 3 possible burns. If it is doing RTLS and landing at LZ-1/2/4 landing pads (LZ 1/2 are in Florida, LZ-4 is in California) then it does a ...
geoffc's user avatar
  • 79.3k
2 votes

What (if any) modifications would SpaceX raptor engines need to run on liquified natural gas LNG?

Some natural gas has sufficient methane content to work as rocket fuel, but not all. As is often the case with aerospace materials, it's not that it's that much better than commercial grade; what you'...
Cadence's user avatar
  • 614
2 votes

What is the point to point suborbital payload of the SpaceX super heavy starship combination for Earth

This Space Review article gives a landed payload of 30 tonnes, seemingly from an interview with Gary Henry of SpaceX. US Space Force staff are also quoted in the article but do not appear to have ...
GremlinWranger's user avatar
3 votes

Query about the spark from the movie Avatharam

You didn't manage to provide the link. Presumably you're talking about this: This is somewhat like a meteor, though the depiction is....weird. I'm not going to spend a lot of time watching the film ...
Erin Anne's user avatar
  • 10.8k
6 votes

Does SpaceX clean the outside of Dragon between flights?

SpaceX Dragon uses an ablative heat shield. That means the heat shield needs to be replaced or at least refurbished after every reentry. This applies both to the primary reentry heat shield at the ...
Jörg W Mittag's user avatar
5 votes

splashdown time Dragon vs Soyuz

Axiom's Ax-3 had a notably long post-undocking orbit time and no clear explanation has been given for why that would be. It was actually just under two days, not three -- undocking was February 7th at ...
Darth Pseudonym's user avatar
2 votes

Is it possible to use the Starlink laser mesh network for science? What kind?

Assuming that the satellite laser links are half-duplex then, when they switch from transmit to receive, there might be an opportunity to do some useful space science. The outgoing beam will sometimes ...
phil1008's user avatar
  • 3,225
7 votes

Is it possible to use the Starlink laser mesh network for science? What kind?

On earth, fiber optics can measure the awakening of cicadas, trains, seismic events, etc. I didn't know about the awakening of cicadas (Wired, November 30, 2023, Cicadas Are So Loud, Fiber Optic ...
uhoh's user avatar
  • 149k

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