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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How long would it take Starship to get to Neptune without any flybys?

After seeing this answer (https://space.stackexchange.com/a/60438/44505) saying that starship could get to Neptune, I wondered how long it would take to get to Neptune. Bonus question: Would it be ...
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If Artemis 1 fails, will it be the end of the program?

The Artemis 1 flight was meant to happen years ago. The program is really expensive and the SLS is not reusable. Other companies like SpaceX or Blue Origin are doing things in a much cheaper and ...
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Why doesn’t SpaceX use Falcon Heavy to launch Starlink satellites?

In this chart that I found here (https://i.stack.imgur.com/f8wOR.jpg) It shows that the price of 1 kg to LEO is cheaper on the Falcon Heavy than the Falcon 9. Also the Falcon Heavy can carry more ...
6 votes
1 answer
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Why aren't smaller fairings used for smaller payloads?

I saw this picture of the DART spacecraft being encapsulated in its payload fairing. Why doesn't SpaceX manufacture a smaller (shortened or thinned) fairing for the spacecraft? It reduces mass and is ...
-3 votes
1 answer
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How much CO2 would Starship 2.0 produce? [closed]

In [a video redacted because why link to a hoax from SE] they show Starship 2.0. It can carry up to 1000 tons into LEO. If this nonexistent spaceship were ever to be theoretical built, how much CO2 ...
13 votes
1 answer
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Is there evidence whether SpaceX is making a profit launching rockets?

Since SpaceX is privately held, I'm not able to find information about whether they are actually turning a profit on their launches of reusable rockets. (Perhaps they are conducting launches, but at a ...
6 votes
2 answers
277 views

How fast could we go back to Uranus and Neptune?

Since SpaceX is making everything so much cheaper to launch into space. If we launch a pair of orbiters to Uranus and Neptune, how fast could they get there? They could be really light and small, so ...
2 votes
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SpaceX reusable rocket - when was technology first available and cost effective?

Today, a SpaceX rocket launching can be 97% cheaper than a Russian Soyuz ride cost in the ’60s What is earliest year such reusable rockets could have been constructed given technology availability or ...
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Will Starship get refueled in Mars orbit?

The current plans of Spacex is to have Starship get refueled in LEO and then fly to Mars and refuel it there on the ground. Will Starship also have to get refuel while it is in orbit around Mars on it'...
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Is there any major difference between acceleration of solid propelled and liquid propelled rockets during launch

Few days ago, ISRO launched its PSLV-C53, which had solid first stage. (Clip here) Also, the SpaceX's starlink launched on 24th July, 2022, having liquid first stage. (Clip here) Is there any major ...
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What is a rocket engine spin up test?

Recently I came across internet about SpaceX's Booster 7 explosion in a ball of fire during an engine spin up test. I searched Google about rocket engine spin up test but I got no hit. What is a ...
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Will Roadster ever encounter Mars?

During it first closest approach to Mars, it was a mere 5 million miles away from the red planet. According to observer.com, it's ultimate fate will be to crash into the Earth or Venus. However, since ...
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1 answer
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What is this squiggly moving line in the recent SpaceX SARah-1 Mission?

I watched the livestream of the launch of the SpaceX SARah-1 Mission. Shortly after the boostback burn there is this squiggly white line that moves away from the first stage, starting at T+03:54. It ...
3 votes
1 answer
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What would happen during an inflight abort in a Falcon 9 if the booster engines did not shut down?

During the SpaceX'S Crew Dragon In Flight Abort Test on a Falcon 9 Launch System, as soon as the abort system was triggered Falcon 9 booster engines was shut down and crew dragon's super dracos ...
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Why is SpaceX spraying water on their barges?

We often see on the SpaceX launch streams that they are spraying water on the deck of the ASDS where the booster will land: There are multiple potential reasons to do this which come to mind: ...
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Can starship land back on earth after sending 100 tons to LEO? [closed]

Starship payload capacity to LEO is shown as 100 metric tons in SpaceX's Page. Can the starship land after sending this payload or will it require orbital refuelling to return to earth? Related but ...
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How many times has SpaceX reused Falcon 9 first stage until 20th May 2022? [closed]

How many times has SpaceX reused Falcon 9 first stage until now? Not about the possibility. I want to know the current progress with the Falcon 9 first stage.
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Does the Merlin vacuum engine on SpaceX's Falcon 9 gimbal?

SpaceX uses the Merlin Vacuum engine on the second stage of the Falcon 9 launch vehicle. Does the merlin vacuum engine gimbal or does the second stage uses only nitrogen cold gas thrusters for ...
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What is the purpose of having a planned hold during a countdown for a rocket launch? [duplicate]

NASA had many with the space shuttle, ULA always had a planned hold at T-4 minutes, and yet other launch providers like SpaceX don't. What is the purpose of a planned hold, and why do some launchers ...
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1 answer
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How many lives have space agencies saved? [closed]

Either the agencies themselves, lives saved by a satelitte launched by them, or how many people would have died if not for space services. How many lives have space agencies saved?
2 votes
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Do the maximum launch capability figures of Falcon Heavy includes payload adaptor fairings or launch vehicle adaptors?

I would like to learn if stated payload capabilities of Falcon Heavy includes PAF. According to Falcon User's Guide, SpaceX has two different PAF for Falcon 9. In the said document, smaller PAF doesn'...
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Were SpaceX's early launches insured?

SpaceX's first three launches (of the Falcon 1) were failures, with the fourth launch being a success. Rockets are generally insured in order to protect the payload investment, but those three ...
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With the new (Feb 2022) NASA SpaceX Crew Dragon contract extension, how much per flight?

NASA awarded flights 7, 8, and 9 for Crew Dragon in an extension of the existing contract, bringing the total value to \$3,490,872,904 . We know that in 2014 SpaceX was awarded about $2.6 billion to ...
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2 answers
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Would it be possible to get a modified SprHvy booster to orbit, then send a full stack with Starship on a "standard" config. Then mate them in orbit?

Ok, so the idea is to get a modified Superheavy booster to orbit minus Starship. Then send a Starship to orbit on a standard configuration and mate the first booster with the recently arrived Starship....
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Could SpaceX deliver the Interim Control Module to the ISS?

Three days ago Roscosmos chief, Dmitry Rogozin, bemoaned the sanctions on Twitter saying they could break the ISS cooperation, asking Joe Biden how he'd manage to manage the course corrections given ...
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What is the reliability of the Merlin engine?

I know that Merlin is extremely reliable, at least over 99%. I do know of one time when one failed, on Falcon 9's fourth launch. SpaceX had used hundreds, if not thousands, of them. I assume there is ...
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Who all has funded "Rocket Cargo" type projects in the last few years? What's the current state of funding for this type of research and development?

In Scott Manley's recent video Elon Musk Hates Flanges - Starship Update 2022 linked below, after 07:32: Another thing that was left out of the presentation was... ...
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1 answer
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Falcon9 return to Cape vs barge landings

Is there a way to know in advance when stage 1 will land either on the barge or back at the Cape?
11 votes
3 answers
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Is a Raptor 2's thermal output really comparable to that of a nuclear power plant?

After about 01:10:10 in the 2022-02-10 SpaceX Starship Update part of Musks answer to Tim Dodd's question about Raptor 2 development: The only remaining issue that ...
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2 votes
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What is the cost breakdown of a Falcon Heavy launch?

I don't know if this was already asked, but I'm very curious about the cost breakdown of a Falcon Heavy launch and what the difference is from Falcon 9's cost per launch. Would it be more or less per ...
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What would happen if a rocket was shot? [duplicate]

After the pre-launch explosion in 2016 of their Falcon 9 rocket, SpaceX seriously considered sabotage, going as far as to see how easy it would be to shoot the Falcon 9 rocket from the ULA building. ...
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What is the current turnaround time for Vandenberg SLC-4E?

Is there public knowledge for the turnaround time for this Falcon 9 B5 pad?
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What is the lowest the cost of launch can get to?

The cost of launch has been dramatically reduced by companies such as SpaceX building parts in house. Once that lowered the cost of launch as much as it could, they moved onto reusing the first stage, ...
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3 answers
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Why do $\text{CH}_4$ (Raptor) engines produce less soot than RP-1 (Merlin) engines?

SpaceX's Merlin engine, which burns RP-1 and LOX, has soot visible after the first stage lands. Many articles on the web say SpaceX's Raptor engine, which burns methane and LOX, is clean. ...
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1 answer
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How did this upper stage end up on a collision course with the moon?

The upper stage of the Falcon 9 rocket that launched the DSCOVR spacecraft is expected to accidentally crash into the moon soon. How did it get into this position? I found answers here that say it was,...
5 votes
1 answer
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Has Falcon 9 block 5's design stopped evolving?

Spacex famously iteratively improves the design when developing rockets, with each unit being slightly (or not-so-slightly) better than the previous. These days Spacex seems to be focusing most of ...
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Why did we think that the object was gonna hit the Moon March 4th 2022? Who's been tracking and predicting it so closely?

The Guardian's 'Out-of-control' Chinese rocket falling to Earth... Oops, I mean Out-of-control SpaceX rocket on collision course with moon says that Bill Gray's Project Pluto/DSCOVR says that the 2015 ...
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1 answer
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Why making such a big deal with Max Q?

At each SpaceX launch, they always make some big deal of Max Q which most of the time comes at around 13Km and at a speed of 1700Km.h-1 But on the way back, stage 1 is at this same altitude of 13km at ...
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Can Starship reach orbit without superheavy, now upgraded as of Jan 2022 to 9 engines and stretched tanks?

Can Starship reach orbit without superheavy, now that it's been upgraded as of Jan 2022 to 9 engines (added 3 vacuum raptors) and stretched tanks? Back in 2018 Elon said on twitter that the earlier ...
8 votes
1 answer
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How close were Starlink-1095 and Starlink-2305 to the Tiangong Chinese Space Station?

Various news outlets reported on the Chinese government complaining about SpaceX Starlink satellites (#1095 and #2305) getting so close to their Tiangong Space Station that they had to initiate ...
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Is SpaceX on the way to a reliability record? [duplicate]

One of the most striking phenomena of Falcon 9 launches is how smoothly they go, at least for the outside spectator. SpaceX launches a lot. Apparently, they have now had 109 successful missions in a ...
3 votes
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What is the maximum thrust of the Starlink satellites?

As in the title, what is the maximum thrust (in N) that the satellites of the Starlink constellation can achieve? I read that they use Hall-effect thrusters, but I couldn't find a specification of the ...
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Does SpaceX still plan to use acceleration (ullage) for Starship refuelings? If so, could they use rotational acceleration?

In the September 2017 SpaceX video Making Life Multiplanetary after 23:40 the fuel transfer process between similar-looking upper stages is illustrated, with the ...
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Could SpaceX Super Heavy (Starship) Booster reach Earth orbit without starship on top?

I'm thinking about orbital fuel tanks for low earth orbit, and even Mars orbit in the event fuel farms on Mars take longer to build than anticipated. That said, Can SpaceX put a nosecone on its Super ...
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Looking for a more specific Raptor engine model, that follows fuel and oxidiser flow. Anyone know where to find good Raptor resources?

Here is our raptor inspired model in SATSIM, our virtual aerospace lab. Want to be able to model the fuel and oxidiser flow at some stage both in Blender, then WebGLbut it's trickier than it looks. ...
8 votes
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Is it possible to create a geostationary surveillance telescope?

Is it possible to create a telescope in geostationary orbit, with real-time video from any country or area? Some applications could be: Monitoring of burning and deforestation; Residential/industrial ...
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At what rate will starship's fuel boil off during a Mars trip? [duplicate]

During the coast to mars, how much fuel will boil off, and how would this be handled?
13 votes
3 answers
3k views

Has SpaceX chosen to drop the Transpiration cooling of Starship? If so, why?

Earlier, there was news about a proposed concept for Starship to include "transpirational cooling" in its reentry heat shield design. These days there is less news about this and tests so ...
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Has a single Falcon 9 ever launched twice in a day?

Musk says in this Tweet on Nov 9, 2019, "If we build as many Starships as Falcons, so ~100 vehicles & each does 100 tons to orbit, that’s a capacity of 10 million tons of payload to orbit ...
2 votes
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How unusual is it to test vacuum engines at sea level?

How are vacuum optimized engines tested without disintegrating them? is an excellent question as it's attracted quite a number of informative and diverse answers. @Uwe's answer informs us that there ...
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