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.

Filter by
Sorted by
Tagged with
6 votes
1 answer
897 views

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 ...
user avatar
3 votes
1 answer
155 views

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 ...
user avatar
3 votes
1 answer
189 views

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 ...
user avatar
  • 2,347
4 votes
0 answers
181 views

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: ...
user avatar
  • 1,306
-3 votes
1 answer
115 views

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 ...
user avatar
  • 2,347
1 vote
1 answer
182 views

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.
user avatar
  • 19
11 votes
1 answer
1k views

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 ...
user avatar
  • 2,347
0 votes
0 answers
65 views

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 ...
user avatar
1 vote
1 answer
133 views

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?
user avatar
2 votes
0 answers
69 views

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'...
user avatar
4 votes
0 answers
155 views

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 ...
user avatar
  • 700
4 votes
0 answers
83 views

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 ...
user avatar
  • 118k
7 votes
2 answers
1k views

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....
user avatar
  • 71
7 votes
1 answer
215 views

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 ...
user avatar
0 votes
1 answer
260 views

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 ...
user avatar
1 vote
0 answers
54 views

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... ...
user avatar
  • 148k
3 votes
1 answer
212 views

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?
user avatar
11 votes
3 answers
3k views

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 ...
user avatar
  • 148k
2 votes
0 answers
107 views

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 ...
user avatar
0 votes
0 answers
94 views

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. ...
user avatar
5 votes
1 answer
97 views

What is the current turnaround time for Vandenberg SLC-4E?

Is there public knowledge for the turnaround time for this Falcon 9 B5 pad?
user avatar
2 votes
1 answer
243 views

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, ...
user avatar
10 votes
3 answers
2k views

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. ...
user avatar
  • 2,347
2 votes
1 answer
110 views

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,...
user avatar
5 votes
1 answer
135 views

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 ...
user avatar
  • 4,234
5 votes
1 answer
268 views

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 ...
user avatar
  • 148k
11 votes
1 answer
282 views

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 ...
user avatar
  • 111
3 votes
2 answers
271 views

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 ...
user avatar
8 votes
1 answer
368 views

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 ...
user avatar
  • 12.1k
3 votes
0 answers
70 views

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 ...
user avatar
3 votes
0 answers
267 views

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 ...
user avatar
  • 273
2 votes
0 answers
66 views

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 ...
user avatar
  • 148k
4 votes
2 answers
423 views

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 ...
user avatar
  • 175
1 vote
0 answers
87 views

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. ...
user avatar
8 votes
3 answers
355 views

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 ...
user avatar
2 votes
0 answers
40 views

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?
user avatar
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 ...
user avatar
  • 411
4 votes
1 answer
220 views

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 ...
user avatar
2 votes
0 answers
76 views

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 ...
user avatar
  • 148k
16 votes
1 answer
1k views

How does SpaceX plan to supply or recycle respiratory gasses?

If Starship carries 100 passengers to Mars, they will consume about 6 metric tons of oxygen and produce about 10 tons of CO2 on each leg of the trip. Much more if they exercise. CO2 could be converted ...
user avatar
  • 6,450
4 votes
2 answers
629 views

Starship: Methane and Oxygen can't both be liquid, except in a narrow temperature range. Is this a problem for interplanetary voyages?

On an extended spaceflight in Starship, the liquid propellant and oxidizer will tend towards the same temperature. The tanks can be refrigerated by boiling off contents, but your mileage may vary ...
user avatar
  • 6,450
17 votes
3 answers
3k views

Why don't Raptor engines use CH3Cl instead of CH4?

The boiling point of CH3Cl is -24 degrees Celsius, whereas the boiling point of CH4 is -160 degrees Celsius. The density of CH3Cl is 2.3 g/cm3, whereas the density of CH4 is 0.6 g/cm3. CH3Cl is polar, ...
user avatar
  • 411
-1 votes
1 answer
93 views

SpaceX Inspiration 4 [closed]

I saw no mention at all from the passengers about seeing the stars during the night portion of their orbits, but with the cupola pointing at Earth all the time they could not have seen them of course, ...
user avatar
  • 35
2 votes
1 answer
274 views

Pressure inside Starship CH4 and LOX header tanks during entire Earth-Mars trip and landing on Mars?

What should be the pressure inside Starship CH4, LOx header tanks during the entire Earth-Mars trip and landing on Mars ? The main CH4, LOx tanks should be under 6 bar pressure, because that is the ...
user avatar
4 votes
0 answers
175 views

How many turbine blades, engine seals and bearings do reusable rocket engines have and how are they inspected?

From previous year statements of SpaceX representatives, the most difficult and longest part of used F9 booster refurbishment are inspections of the most volatile parts of the booster's nine Merlin ...
user avatar
1 vote
0 answers
212 views

SpaceX Inspiration4 mission cost breakdown

It is believed that SpaceX Inspiration4 total mission cost was more than 100 million USD. https://twitter.com/DJSnM/status/1439470685064073219 What could be cost breakdown for this mission ? After ...
user avatar
2 votes
1 answer
172 views

Why are the metal tubes of Mechazilla base thinner than the tubes of its claw?

From here and other sources. You can see that the lines at the left ("claw") are thicker than lines ar right ("base.") Why? Intuitively, it seems that it should be the opposite.
user avatar
  • 723
3 votes
0 answers
127 views

SpaceX estimates for Starship and Super-heavy heat shields maximum heating during their orbital and suborbital reentry

Did SpaceX made public their estimates for Starship orbital vehicle heat shield maximum heating (and overall reentry heating profile) during orbital reentry on Earth and same for Super-heavy booster ...
user avatar
13 votes
1 answer
4k views

Cost per launch to ISS: Starliner vs Crew Dragon

What is the cost to NASA per launch to ISS of Starliner vs Crew Dragon? The Crew Dragon flights uses the SpaceX Falcon 9-FT with the first stage reusable, along with the partially reusable Crew ...
user avatar
  • 573
14 votes
1 answer
394 views

What is the heat shield refurbishment procedure for a crew Dragon capsule?

How, specifically, is the heat shield replaced or refurbished? More precisely... How do they know it will work for the next mission? :-P
user avatar

1
2 3 4 5
27