Questions tagged [spacex]

Space Exploration Technologies Corporation, or SpaceX, is a private space exploration company. It was the world's first privately held company to successfully launch a cargo mission into space and a crewed mission into orbit. See wiki for related tags.

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What is the Starship forward dome?

What is the Starship forward dome? How does it look like? What other parts are connected to it and what is it good for?
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Are SpaceX launches from California going to retrograde orbits?

SpaceX has a launch site in Vandenberg Air Force Base, California. Will satellites launched from that place have a retrograde orbit?
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Why is the SpaceX crew-1 mission more important than the previous one (demo-1)?

The previous one was also crewed (two crew) but it was called "demo" for some reason - despite taking astronauts to the ISS. How is the recent one different?
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Why do some rockets have closed boattails around the engines and others do not?

During launch and landing, dust, dirt and debris may be stirred up. For non-gimbaling engines like the vac Raptors on Starship, can't the engine fairing/boattail be closed? I imagine titanium sheet ...
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How many Crew Dragon spacecraft are SpaceX planning to operate?

NASA has bought six Crew Dragon flights and there is at least one private flight booked for next year. There are currently two flight-capable Crew Dragon spacecraft. Is SpaceX currently building ...
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What are these shiny wrist plates worn by astronauts in the SpaceX crew capsule

What are these shiny wrist plates worn by astronauts in the SpaceX crew capsule? screen shot from the NASA YouTube video Watch NASA's SpaceX Crew-1 Mission Arrive at the International Space Station
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“…extending the Starlink network using longer-range laser comms and relay satellites to reach Mars and Starships in-transit” (Musk & Shotwell)

I have it on good authority that SpaceX's Elon Musk and Gwynne Shotwell: ...have talked about extending the Starlink network using longer-range laser comms and relay satellites to reach Mars and ...
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Would this Starship design alternative be viable?

Considering Starship atmospheric entry, belly dive and "bellyflop", latest iteration displays four aerodynamic surfaces, two aft fins and two carard fins. Soon will this configuration be put ...
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Which Tesla Roadster was launched into space?

Which Roadster was launched into space? What year was it made? I cannot find any information about it. On Wikipedia, there is an image of it from 2010, so it is at least that old. It doesn't look like ...
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Testing of rocket heat shield on Earth

One Space Shuttle was destroyed due to failure of the insulation tiles. SpaceX is reportedly using another technology, which replicates sweating , for wearing off the reentry heat. How is the ...
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Starship vs submarine hull [duplicate]

Just out of curiosity, which can endure higher internal pressure - submarine hull or starship fuel tank? Any comparative figures in bars? I guess, in vaccum explosion can happen and under the deep sea,...
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How heavy is SpaceX's Octagrabber?

SpaceX's drone ships have a vehicle that drives under a booster after landing and then clamps onto it to secure it. Photos of it suggest that it has neither ballast nor any way to clamp onto the ...
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Is Falcon 9 repainted before reuse?

Before reusing the first stage of Falcon 9, is it repainted? If yes then why?
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Can the grid fins affect the rotation of the Falcon 9 descent?

Can the grid fins control the rotation of the Falcon 9 on descent? How would they have to be positioned to stop the rotation? If used to rotate the ship, then how they would they have to be positioned ...
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Could SN8 miss its “bellyflop” if Center of Gravity is too far forward?

Very excited about the upcoming Space X Starship SN8 test flight, but was concerned about the ability to perform the high drag horizontal belly flop with some of the rocket thruster hardware missing ...
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Are there Starlink train-finding websites?

In Astronomy SE Line of lights moving in a straight line, with a few following is the canonical close as duplicate target for questions about the likely seeing of recently deployed Starlinks that move ...
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How much will Starship SN8 weigh on liftoff?

Apparently SN8 recently underwent a 'Cryo' pressure test and to do that the press stated that 1000 tonnes of liquid Nitrogen was used! Is that really true? That got me thinking: just how much does ...
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What was the SpaceX Falcon 1 team size?

Virgin Orbit's LauncherOne has a team of 575 employees and the rocket needed 700 million USD investment. Falcon 1 is very similar in size and it required 90 million USD investments. Electron rocket is ...
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What are these white garbage-like things on Falcon 9 vacuum engine?

On recent launch I noticed, that some white things jumping on vacuum engine in space. Something like garbage or condensate. See video at right at times when Earth is at left: ...
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How throttle changes affect calculations of thrust?

So, for constant throttle setting equation to calculate thrust looks like $ \ F = \dot{m}_\mathrm e V_\mathrm e + (p_\mathrm e - p_0) A_\mathrm e$ But if we are looking at flightclub.io simulation, ...
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Why is the water pumped out of the holding tank a minute before Falcon 9 liftoff?

SpaceX Falcon 9 - starlink mission on October 5. Video : Why is the water discharged at T- 01m:30s from the holding tank far away from the launch pad? This was also ...
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Simulating launch velocity of falcon 9

Help! I finished my numerical simulation of falcon 9 launch in google sheets, where I calculate all the value changes with time. But, when I looked at real launch to compare the values, I got really ...
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What are the highlighted rectangular objects on the SpaceX's CRS 21 Dragon capsule?

What are the rectangular objects seemingly placed where otherwise Super Dracos would be - in this picture of the CRS 21 Dragon 2 capsule? Reference: https://twitter.com/SpaceX/status/...
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In Crew Dragon do the astronauts feel like flying upside-down?

When looking at Crew Dragon flight paths diagrams I saw that for phasing burns and deorbit burns they don't use the side thrusters, as I would expect, but four thrusters mounted at the "top" ...
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How often has the Hitchhiker's Guide to the Galaxy been in space?

I came across an answer saying that a copy of the Hitchhikers Guide to the Galaxy was sent to space in Elon Musks roadster (in 2018). Has the book been in space before that (maybe taken to the ISS by ...
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How long it takes for the Falcon 9 payload fairings to reach the sea?

The payload fairings of Falcon 9 are released at about 3:15 min How much time they need to fall and reach the sea? And what is their maximum speed while reentry?
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The numbers on the live Falcon 9 videos

In the live Falcon 9 launch videos there are two numbers displayed at the bottom-left corner of the screen. The two little circular and text gauges that have the units under them. I guess they are the ...
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Falcon 9 landing stages

I know the first stage of Falcon 9 separates at about 2:30 min and it lands at about 8:30 min But what are the distinct stages of the descent? Like deorbit burns, grid fin deployment, leg deployment ...
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Is there any live classes for learning about Mars and Universe by professionals?

I have 10 year old son and he is crazy about Mars, Space, Blackholes, Universe , Rockets, and Satellites. Right now he goes to youtube and tries to learn. But we don't know which video is good and ...
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Quantum technology for starship communications and landing on Mars

Based on practically proven Quantum-Entanglement principle, any entangled quantum switch in this universe can be flipped instantaneously from elsewhere. Can it be used to send information from far off ...
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Falcon 9 Merlin 1d thrust calculated through every moment of flight

I am currently trying to recreate the launch of falcon 9 in unity. For the calculations I need the thrust of the first stage (only doing it for one stage for now). How to calculate it depending on the ...
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Did anyone ever launch a rocket, filmed by another rocket in mid air?

I recently analyzed some SpaceX launch footage (a Starlink deployment on September 3). I noticed a switch in camera perspective at T+00:02:20: from cameras on the ground to those attached to the ...
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Till what altitude above earth sounds can be heard?

In the new video of SpaceX SAOCOM 1B launch and landing RCS thrusters and other sounds can be heard during boostback burn. Falcon 9 boostback happens at nearly 100 Km altitude. Does the air density at ...
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Falcon-9/Starship landing on an uneven surface

I was wondering how a Starship or Falcon-9 booster could land on an uneven surface, like that of the Moon or Mars. Is the landing gear similar to the Boeing hydraulic landing gear, which cushions and ...
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Do space suit designers exist?

I was just having a closer look at the new space-suits by SpaceX, that were worn by NASA astronauts Bob Behnken and Doug Hurley (image below this question). The design made me wonder about who may ...
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Why are the SpaceX Starship, “rings” the width that they are?

Why are the SpaceX Starship, "rings" the width that they are? Wouldn't creating the rings from SS that's twice as wide reduce the welding by half?
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Roll Maneuver in SpaceX Demo-2 Launch?

I couldn't see a roll maneuver early in the launch of the demo-2 mission, and this left me wondering if SpaceX skipped the maneuver. Would they do the pitchover without roll? Also, I've noticed in one ...
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What are the protrusions on the outside of the Falcon 9 nose fairing?

Near the base of the Falcon 9 nose fairing is an array of square protrusions (marked in red) that you'd probably want to avoid unless they serve a very essential purpose. Does anyone know what that ...
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SpaceX Dragon Shape: Power Series, Ellipsoid, or Haack/Von Karman?

The SpaceX Dragon module has a round apex typical of power series, ellipsoid, and Haack/Von Karman shapes. I'm wondering which of these SpaceX actually used. References would be appreciated. My guess ...
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How tall is SpaceX's launch mount in Boca Chica, TX

SpaceX has a render of Starship launching from a tall launch mount. How tall is the launch mount not including the tower or launch hardware?
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Is there an official flight profile of the reentry of the Dragon spacecraft?

I wonder whether there's an official plan of the reentry and landing of either the former Dragon spacecraft or the Dragon V2/Crew Dragon, with details like altitudes, velocities, burn length and ...
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How will Amazon's constellation differentiate itself from SpaceX's and OneWeb's?

The New York Times' Amazon Satellites Add to Astronomers’ Worries About the Night Sky says: Much of the attention on these strings of satellites has been placed on the prolific launches of SpaceX and ...
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Could the Space X “Starship” be modified for point to point travel on Earth?

After seeing recent successes with the SN5 prototype, powered with very inexpensive LNG, designed to carry 100+ people, is this ... an airliner? A suborbital Starship could make trans Atlantic and ...
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Merlin combustion chamber pressure

What is the combustion chamber pressure for Merlin? I mean the average and the maximum The Raptor engine was tested with a maximum 330 bar. I would like to compare them
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How much krypton is stored on a Starlink satellite?

How much krypton (fuel) is there for the krypton-powered ion thrusters on Starlink satellites and how long does it last?
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Why isn't SpaceX constructing the Super Heavy launch mount on top of the water?

With SpaceX creating their launch facility in Boca Chica Texas, right next to the water, why would they bother building a huge launch pad to withstand the blast, as opposed to building it on top of ...
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mass of the decks in the crewed SpaceX Starship [closed]

I want to work out the approximate mass of a Starship (crewed version) deck. We can assume an internal diameter of 8 meters with a 1.5 meter diameter central support tube. The loading is uncertain but ...
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What damage/repairs have to be done to the launch pad every time SpaceX launches?

As SpaceX is a company that is very focused on rapid reusability, low-cost operation and a philosophy of "the best part is no part", what repairs have to be done to the towers and general ...
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Is Crew Dragon rated for any non-Spacex boosters?

The Spacex crew Dragon uses the Falcon 9 for its orbital launches, and is not set to ever use a different launcher. However, an uncrewed Dragon will probably launch on the Falcon Heavy, as is planned ...
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Is this soot building up on the Falcon 9 interstage?

In the below video of stage separation during Falcon 9's CRS-19 mission, the exhaust of Stage 2's Merlin 1D-Vac impinges on the interstage. It also deposits a black substance on the white paint. Is ...

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