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 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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Are Elon Musk's SpaceX rockets better than the Russian rockets? [closed]

What are the advantages and disadvantages of SpaceX rockets VS Russian rockets?
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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. ...
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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?
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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 ...
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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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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 ...
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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 ...
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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, ...
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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, ...
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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 ...
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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 ...
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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 ...
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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.
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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 ...
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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 ...
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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
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Spacex NASA GOES-U 2024 contract to use Falcon Heavy?

https://www.nasa.gov/press-release/nasa-awards-launch-services-contract-for-goes-u-mission Why would they use Falcon-Heavy instead of Falcon-9 FT for the GOES-U 2024 satellite launch? Falcon-9 FT has ...
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Why does the Crew Dragon seem to rely primarily on a low bandwidth downlink for voice communications?

What are the particular reasons that the Dragon Capsule is not communicating via Starlink, or that it seems that the audio and video downlinks from the Dragon Capsule are on separate streams?
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When docked, do Dragon solar panels contribute to ISS mains power?

What it says on the tin. Does a docked Dragon trunk section contribute to the ISS's batteries? I'm aware it would probably be minimal though due to orientation and occlusion of the panels, and when ...
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Will the International Space Station be able to see the Falcon 9 (Inspiration4 launch)

Will astronauts aboard the International Space Station be able to see any part of the Inspiration4 flight of the Falcon 9 during launch and/or during orbit?
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What is the theoretical smallest size limit for a phased array antenna that can reach LEO?

Now that one provider is operating a phased array ground-to-satellite internet comm system, others will follow. A frequently asked question is "When can we use Starlink with a sat phone?". ...
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How does a returning Falcon first stage decide when to end its re-entry burn?

When a Falcon 9 first stage is returning to Earth to land, it performs a brief re-entry burn in order to slow down. My question is, what criteria does the first stage control software use to decide ...
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Do forward thinking launch providers like SpaceX, Blue Origin or Virgin Galactic fund any carbon nanotube research?

Elon Musk has indicated (ex.: Tweet) that he has little interest in carbon nanotubes (CNTs) with respect to the concept of an orbital elevator, claiming in essence that the development is simply not ...
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Why do recent launch vehicles like that of Space X and Rocket Lab have far fewer umbilicals than before? What has changed?

Launch vehicles using mobile launch pads have many umbilical connections, whereas the ones using TEL launch structure with strongback, don't. Why is that? As seen in the picture, Electron has just one ...
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Why will the final version of Starship be almost empty after its first launch?

It has been announced that SpaceX Starship SuperHeavy will need 16 launches with the tankers to refuel Lunar Starship. Why is the Starship going to be empty after reaching orbit, since the booster is ...
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Which Falcon-9 launches were of a Falcon-9R rocket?

I have heard about Falcon 9 1.1 and Falcon 9 FT, but what is a Falcon 9R? If I understand correctly R = "reusable" which seems to apply to a lot of them. Are the Falcon 9 FT rockets launched ...
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How can the Starship booster stand vertically without falling over?

How can the Starship booster stand vertically without falling over? In my day to day experience, similar long objects (simple objects that can be easily found in thehouse) tend to fall easily with a ...
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How did SpaceX carry out livestreams initially? [closed]

The thing that probably captivated many of us here were the videos of the Falcon heavy boosters landing back perfectly. How would one build a similar setup?
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Why SpaceX have only one planned potential launch of F9 on their July manifest?

Why SpaceX have only one planned potential launch of F9 on their July manifest. https://en.wikipedia.org/wiki/List_of_Falcon_9_and_Falcon_Heavy_launches It show only one potential F9 launch from ...
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How could Starship "deep space variants" improve payload performance by "orders of magnitude" (Elon Musk)?

Replying to Scott Manley's tweeted table of payload mass for a given geocentric C3, Musk tweeted: We could stretch the Falcon Heavy upper stage & increase this a lot, but FH already covers all ...
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Does the US government plan to issue "Astronaut Wings" for anyone passing 80 km forever?

Related and potentially helpful here: What kind of badge will tourists who performed a sub-orbital spaceflight receive? but here I'm asking specifically about the US government's future plans. The BBC'...
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Is or was STARGATE really being used for SpaceX launches at Boca Chica or otherwise?

The 2015 answer to For SpaceX's Texas launch site, what kind of range radar/tracking will they have? links to The Spacecraft Tracking and Astronomical Research into Giga-hertz Astrophysical Transient ...
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Keep a 2nd stage in orbit and refuel [closed]

Why does SpaceX not develop a second stage that can be used to meet with a first stage to pick up payload and refuel, thus transporting goods to orbit repeatedly instead of being used only once?
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How do SpaceX intend to transport their starship/super heavy?

One of the design constraints of the Falcon 9, its skinniness, is to allow it to be transported by truck back to the launch site. Falcon 9 is 3.7 metres in diameter, whereas Starship and the super ...
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Puzzler; what can we learn about the distance and direction of Earth from this cool SpaceX-tweeted image of Earth and a vacuum nozzle?

The 18-June-2021 Spacex-tweeted below says: View from Falcon 9's second stage Merlin Vacuum engine There is information out there about the approximate exit diameter and length of the nozzle and ...
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Just how "unreasonably gigantic" was the exclusion zone for the scrubbed SpaceX's Transporter-2 Mission first attempt?

Watching Transporter-2 Mission, currently after 15:02 in the video (after an extended hold at T-00:00:11) I heard a voice say: ...
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Do space transportation firms such as SpaceX receive a financial compensation if a launch is cancelled because of an airplane entering the launch zone

I read on https://arstechnica.com/science/2021/06/spacex-to-launch-second-rideshare-pressuring-small-launch-industry/ (mirror 1, mirror 2): The countdown clock got to T-11 seconds on Tuesday ...
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Which Launching State HASN'T breached its obligations under the 1976 Registration Convention?

(the wording of my question above is voluntarily provocative, but the actual question below may be even more) The context: The 1976 Registration Convention is part of a set of Treaties that ...
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SpaceX live broadcast of booster & boat's eye view of the GPS III Space Vehicle 5 were both uninterrupted; have they make some upgrades to the system?

This answer to Why does the video feed always fail during Falcon 9 landings? shows that SpaceX seems to be "getting better at" or "less shy about" broadcasting continuous live ...
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What exactly are "launch tables" and "dog bones" in the context of SpaceX's Super heavy-lift launch vehicle, as shown in these images?

@geoffc's Pod Bay comment and link Great aerial photo of launch table with the 'dog bones' being installed. So curious how this will all play out! https://twitter.com/RGVaerialphotos/status/...
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Is there a record for unbroken series of "successful launches" by some objective criteria? Who has it now? What has to happen for it to change hands?

From the (I'd say) historic and pivotal hearing Wednesday, March 5, 2014 Defense Subcommittee (Chairman Durbin) Time and Location: 10:00 a.m., in Room SD-192 of the Dirksen Senate Office Building ...
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Does NEPA currently categorically exempt satellite systems? Is there any legal basis to Viasat's request for the FCC to consider light pollution?

Space News' Viasat asks FCC to halt Starlink launches while it seeks court ruling says: Viasat formally asked the Federal Communications Commission to stay an April 27 license modification that ...
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Would it be possible to alter the orbit of one satellite, with the exhaust plume of a rocket sufficient to deorbit it?

SpaceX plan to launch Starships towards Mars; many of them. This will involve burning hundreds to thousands of tonnes of propellant in low(ish) orbit, since each may require several refueling steps. ...
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Can we afford to increase rocket launches when we are are in desperate need to cut down emssions? [duplicate]

I love SpaceX and what they are doing with rockets and reusability, but their work is also going to exponentially increase the demand for new launches to orbit. If we are ever going to create a self ...
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Are Starlink satellites flaring?

The "Old and Busted" Iridium satellites flared like crazy because they had big flat metal surfaces for their phased array antennas (that were certainly so shiny completely by accident and ...

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