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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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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Mars Colonization Project for Kids [closed]

I see Bahrain NSSA organized competition to design. "Mars Colonization' for 7-12 years old. Is this a good idea, can students at that young age do all these ? or may be this generation is smarter ...
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1answer
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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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Why don't astronauts email their inventory?

I was looking at the SpaceX Dragon capsule reentry. At some time after wake-up Bob gave a precise account of what was consumed from which bag. So many bottles of water, so many breakfasts, this bag ...
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What happens to payload fairings of GEO launches?

Say you launch a satellite into GEO using Falcon9 The 1st stage returns The 2nd stage is moved into graveyard orbit. But what happens to the payload fairings?
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How much pressure would the raptor engines experience when Starship does an atmosphere entry burn at Mars?

The Starship second stage has 3 sea level engines and 3 vacuum engines. When doing the atmosphere entry burn to mars, how many Bars will the raptor engines experience? I'm thinking that because of the ...
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How could SpaceX’s crew Dragon land with abort thrusters in case of emergencies?

Reading this question and this article linked in one answer, in case of two or three main parachute failure, how could super-dracos be able to slow down vertical velocity short before touchdown, since ...
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What prevents SpaceX from increasing the cadence of launches?

Many companies can afford and buy expensive launches (Ariane etc) so they prefer SpaceX to save money. Many other companies can't afford Ariane launches but they would afford Falcon 9 launches. Lower ...
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How many times can Falcon 9's payload fairings be reused?

Falcon 9's first stage can be reused 10 times or even 100 times. But how about its payload fairings?
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When does Falcon 9 second stage separate?

For a regular LEO payload, when does the second stage separate? Usually the first stage separate 2:30 min after launch (and it takes 6 minutes to come back to Earth) so how about the second one? ...
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1answer
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Could the Crew Dragon be used to re-boost the ISS?

In an answer to a related question, Jörg W Mittag wrote the following: But more importantly, handling of the Superdracos is currently rather simple. They are safed after reaching orbit and then never ...
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Can the SuperDraco engines aboard Crew Dragon be used to save the crew on splashdown if the chutes failed?

I've heard it several ways, so I should ask here. In the case of a main chute failure, are the SuperDracos able to attempt a contingency propulsive splashdown to save Dragon's crew? If this is in the ...
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Electrical power requirements for Starship or Falcon 9

Anybody know where one could dig up electrical requirements for Starship? In other words, if Starship were sitting on the launch pad drawing power prior to launch, what would the load be? I imagine ...
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Why was the SpaceX Demo 2 spashdown livestream so devoid of visuals?

Today's successful splashdown was tremendously boring compared to what we are used to from SpaceX launches. The mission statistics, the timeline, inner cockpit, etc was not shown during the telecast. ...
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Have other space capsule splashdowns attracted a crowd of civilians on boats?

We saw on the SpaceX Demo 2 splashdown livestream that various clearly-non-mission-associated civilian boats appeared to approach the Crew Dragon within 100-300 ft. Has this happened on any previous ...
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What was the Crew Dragon reentry mass for the mission that landed August 2, 2020?

What was the Crew Dragon reentry and touchdown mass for the mission that landed August 2, 2020? (I found that Soyuz Descent Module has a reentry mass of 2850 kg.) See: http://www.braeunig.us/space/...
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How many Raptor engines will Starship use for TMI and Mars landing?

The Starship second stage has 3 sea level engines and 3 vacuum engines. I don't imagine that all 6 will be used for trans Mars injection, as it isn't very efficient. And for the Mars landing which ...
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Speed of propagation of unconstrained detonations in atmosphere

SN4 SpaceX's test tank went boom. It was a mixture of methalox (methane + oxygen). When it exploded it caused a shock front, what was the speed of this explosion? Do all shock-waves like that travel ...
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Methane or LOX tank at Boca Chica

As we can see on this picture from Mary (bocachicagal) on NASASpaceFlight, there are two types of tank near the test stand. Some are black and others are white but why?
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Altitude at which Falcon boosters go subsonic during reentry

Is there a distinct altitude at which Falcon boosters goes subsonic during reentry? If so, which is it? Is it +/- the same altitude for every flight?
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Why does the government still fund SLS while SpaceX is cheaper and has the same capabilities if not better?

Due to SpaceX's recent advancements in now proven rocket tech, why does the government still fund (what some would argue to be bloated) cost-plus contracts with Boeing and Lockheed? Am I missing ...
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Falcon 9 second stage roll control: fins or dracos?

Unlike the first stage, the second stage has just one gimballed engine, meaning it can counter pitch and yaw perturbations, but not roll perturbations. Fins are effective for roll control, but at 50 ...
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How will the recovery of the first crewed Crew Dragon water recover differ from previous recoveries of Crew and Cargo flavors?

The NASA video Expedition 63 Inflight with New York Times, Fox News, and USA Today - July 7, 2020 includes an interview with Fox News reporter Bill Hemmer, who asks: I am most interested in your ...
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Why would the Falcon 9 Block 5 carbon fiber thermal protection material need to be hydrophobic?

This answer to Nature of “the silky black 'highly flame-resistant felt'” on Block 5 Falcon 9's, and its intended functions? contains the following: This came into Falcon 9 design with Block 5 ...
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Can SpaceX Starship Be laid on it’s side?

SpaceX is building Starships at a good tempo and may finally build them faster then they scrap them. The Falcon 9s have always been stored horizontally and erected at the launch pad. I’ve never seen a ...

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