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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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 does SpaceX plan to deal with boiloff on the trip to Mars?

Both BFR booster and BFS are to run on Raptor engines, fueled with liquid methane and liquid oxygen - cryofuels. The trip to Mars will take at least a couple months, and BFS requires fuel for powered ...
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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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Why doesn't carbon fiber overwrapping in LOX catch fire? (watch this video first)

Sir Martyn Poliakoff, also CBE FRS and his team produce a fascinating series of Periodic Videos. In this one they team up with Smarter Every Day's Destin Sandlin to do high speed video of a piece of ...
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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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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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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 great 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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Do they assemble the Falcon Heavy on the TEL?

The Falcon 9 stages, by themselves, are usually stored on rotisserie style mounts, that allow the stage to be rotated and worked on easily. That is, if the engineer needs access to the top, instead ...
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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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Why isn’t the “JRTI” barge larger?

The barge that SpaceX's Falcon 9 was trying to land on is creatively called "Just Read The Instructions"(hereafter known as JRTI). I've been told that SpaceX is using the barge to avoid a land based ...
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How could a hydrazine and N2O4 cloud (or it's reactants) show up in weather radar?

Question: How could a hydrazine and N2O4 cloud (or it's reactants) show up in weather radar? Tweet: This is what an ‘anomaly’ looks like on weather radar. Tweet (with GIF): Dragon's static fire ...
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Is the supercooled LOX used in Falcon 9 Full Thrust a first?

One of the changes made to the Falcon 9 v1.1 Full Thrust was using supercooled liquid oxygen at 66 K (-340 F) as well as chilled RP-1. I've seen various claims that this is a first in the industry. ...
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Has SpaceX re-used a first stage twice yet?

SpaceX has re-used a first stage once, several times now. Has it re-used the same first stage twice yet? If not, has a particular mission been named that will be the first second re-use?
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Will the Falcon Heavy make the first full fairing reuse ever?

The two side boosters will need some kind of aerodynamic protection, which could very much be recovered with the rocket in one piece. Will they be recovered and reused?
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Where can I find the TLE of ExseedSat 1, India's first ever private LEO satellite?

On 3rd December 2018, a private Indian company Exseed Space launched it's first ever satellite into space called ExseedSat 1. But I couldn't find the TLE for this satellite. I looked it up on n2yo ...
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When will the first Falcon-9 send something to the Moon? Will it be iSpace's HAKUTO-R?

The Teslarati article SpaceX customer iSpace updates Falcon 9-launched Moon lander, rover plans says Japanese commercial space company iSpace has provided an updated schedule for its first private ...
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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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Modeling SpaceX's lift and drag versus angle of attack and Mach number

I've been trying to find data in the literature that would provide analytical expressions for the relationship between the lift and drag of an object similar in shape and size to the Falcon 9 first-...
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What happened to the SpaceX Starship SN11? Why did it crash?

What happened to the SpaceX Starship SN11? As per the live streams held on YouTube, I want to know what really happened to SpaceX Starship SN11 The live streams show a lot of smoke and others show ...
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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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Autogenous pressurization with sub-cooled propellant

In his IAC 2016 talk, Elon Musk said (at 28m 4s in the video) that the ITS booster tanks would use autogenous pressurization. This means there is gaseous oxygen resp. methane in the tank. To stay ...
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Will the Falcon Heavy be far enough in 12 seconds to not cause damage?

Elon Musk has stated that he will consider it a success if the Falcon Heavy gets far enough away from the launch pad to not cause damage if it blows up. The Falcon Heavy underwent a 12 second static ...
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What is meant by "a high-energy geostationary orbit"? (SpaceX Arabsat 6A)

The Teslarati article SpaceX’s April 7th Falcon Heavy launch a step toward new commercial markets says: While there is some inherent uncertainty surrounding the (once again) fairly new rocket, ...
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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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How far downrange would a reusable Falcon 9 first stage land (without fly-back)?

Let's imagine a rocket like the Falcon 9 recovers its first stage via a soft landing, but doesn't attempt a return to the launchpad. For the sake of argument, let's imagine that there are no ...
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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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What is producing these strange lights around the Falcon 9 grid fins (Starlink launch)?

Early in the video of the launch of the first sixty SpaceX Starlink satellites we can see that after stage separation the first stage grid fins open. Around that time there are some phenomena I don't ...
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What (the heck) is this purple donut in the video of the Falcon 9 fairing's atmospheric reentry?

This SpaceX tweet (found in CNET's SpaceX camera captures incredible view of rocket part returning to Earth) shows a video taken by a camera in one half of the fairing on the recent STP-2 mission and ...
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How did the communication work between the SpaceX Tesla and Earth?

With a Tesla launched in space and HD cameras put on it, I can imagine its not easy to receive a signal from that slowly spinning, multiple ten-thousand km away new artificial object in our solar ...
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Is Starship planned to fly directly to the ISS without first stage? Is it even possible?

I'm having difficulty understanding how/if Starship and/or Super Heavy could be used to deliver crew to LEO. Is it expected to deliver astronauts to the ISS Crew-Dragon-style, but without the 2nd ...
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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 or bright and shiny metal, ...
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How far from launchpad did Falcon 9's first stage go?

On December 21st, 2015 on the Orbcomm OG2 mission, Falcon 9's first stage landed 6 miles from its launchpad. What was the highest altitude reached by the first stage, and how far did it go from the ...
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What is the burn time for the F9 boostback / reentry / landing burns?

I'm trying to figure out the timing of the 3 recovery burns and the total fuel reserve needed to perform them. [Answers Inlined] Boostback: [30] seconds of 3-engines at full-thrust. Reentry: [20] ...
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Falcon 9 - relief valves closing times

From what I understand, prior to the launch, the relief valves are open to allow some of the boiling LOX to evaporate and be replaced with fresh, cold one (we can see oxygen evaporating - and "...
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How did Falcon 9 deploy 11 satellites?

Falcon 9 Flight 20 has successfully deployed 11 ORBCOMM satellites into orbit. I can easily imagine a rocket deploying 1 or 2 satellites. But how did Falcon deploy 11 satellites in a single flight? ...
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What pattern of satellite release will the pentagonal Iridium arrangement use?

The first ten of eleven OrbComm satellites were deployed in opposing pairs at five different times. The 2nd stage performed roll maneuvers to make sure the initial velocity and/or attitude were ...
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A nicer way to download the positions of the Orbcomm-2 satellites

I'm trying to watch the Orbcomm-2 satellites evolve into a constellation. They were recently placed in orbit by SpaceX (their video here) and the details are discussed in this excellent question and ...
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What was the distant bright light in the SpaceX webcast of Orbcomm OG2 deployment?

As I was watching the SpaceX launch today on YouTube, I have noticed a bright distant light as the satellites were being deployed. What was that light? Also, after each deployment there was something ...
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1answer
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DId the Falcon 2nd stage turn around [UPDATED] and point "backwards" before the Orbcomm-2 deployement started?

It looks to me like the camera used for the deployment part of the Webcast shown on YouTube is located near the "bottom" of the payload area (closer to the engine & tanks) - in which case, did ...
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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 will SpaceX's Starship accommodate its 100 passengers from the effects of micro-gravity?

According to this Wikipedia article, Starship will take on average 115 days (3.8 months) to get to Mars and 150 days maximum (4.9 months). with an average trip time to Mars of approximately 115 ...
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Why not land SpaceX's Starship like a plane?

I get the reasoning behind designing Starship to land upright. It doesn't require landing gear and the turnaround is expected to be much faster. But I'm beginning to question that logic. I think the ...

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