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. See wiki for related tags.

Filter by
Sorted by
Tagged with
4
votes
0answers
49 views

During ascent, can SPACE-X ever be seen from Long Island, NY?

At night I have seen Space Shuttles' engine exhaust from Long Island NY, in the southeast sky 7 minutes after liftoff from the Cape. Does Space-X ever launch in a direction that it can be seen from ...
9
votes
0answers
68 views

Why did SpaceX swap the LOX and CH4 tanks between Mk1 and SN1?

According to most sources, the Starship Mk.1 had its LOX main tank (not talking about the header tanks here) on top and its main methane tank below. But it seems the SN1 revision, and all subsequent ...
8
votes
0answers
73 views

Do Starlink satellites have cameras?

Obviously, Starlink satellites are equipped with sensors for attitude and location detection (like a star tracker or sun tracker) but I'm wondering if they have with any direct Earth observation ...
3
votes
1answer
170 views

Is Starlink 1130 (Darksat) really dimmer?

I measured a couple of Starlink satellites tonight, finally, Starlink 1130 (Darksat) arrived (March 17th 2020, 20:15 local time). I could not see the sat on the screen although I turned up to gain a ...
24
votes
5answers
7k views

Why is NASA building its own rocket for the moon mission when it could use SpaceX's?

I read in this article that NASA is building its own rocket for the moon mission. Why would they build their outdated and inefficient rocket, when they could instead use a SpaceX rocket and use their ...
15
votes
2answers
4k views

Why create a production line for the SpaceX Starship?

We read that Elon Musk is focusing not only on designing a functional new space vehicle, but almost foremost on creating a production line of Starship. In addition to the existing and expanding Texas ...
6
votes
1answer
146 views

How is the water from a launchpad recovered? (If it is)

Knowing that the water on a launch is used for both noise suppression and surface cooling, do they recover the water that isn’t evaporated by the launch to use again? And if they do, how so?
11
votes
4answers
3k views

Why would someone need vertical loading for a SpaceX rocket?

Was reading about the new vertical pad loading system SpaceX wants to build. Of interest was this quote Known as a mobile service tower (MST), SpaceX has managed to avoid the need for the expensive,...
6
votes
0answers
131 views

Does the low gravity on Moon eliminate the need for a launch pad/flame trench for a reusable rocket launch?

I'm new to rocket science and I learned how the rockets do not reach full thrust immediately and isn't really stable for the initial couple of seconds - hence the need for "launch clamps" and a ...
3
votes
1answer
161 views

Will SpaceX Starship have launch abort system? [duplicate]

Since future SpaceX Starship is planned as long duration passenger spacecraft for multiplanetary transport will it have launch abort system? Also how is crew evacuation planned during interplanetary ...
21
votes
2answers
4k views

What is a thrust puck on Starship?

Elon Musk recently mentioned a Thrust Puck on Twitter, "We’re stripping SN2 to bare minimum to test the thrust puck to dome weld under pressure, first with water, then at cryo." He also mentioned ...
2
votes
0answers
73 views

Will SpaceX use a special launch maneuver for the SAOCOM 1B mission?

Teslarati's SpaceX sets date for first Florida launch of its kind in more than half a century explains that something different will happen. For those that want to read the article first, I've used ...
3
votes
1answer
154 views

What are common rocket fuselage designs?

I am wondering about the basic design considerations when building a rocket body. is it made as a separate hollow cylinder with standalone tanks inserted inside? is it made so that the tank walls are ...
3
votes
1answer
105 views

What are the orbits of all Starlink satellites launched?

Latest batch of SpaceX Starlink satellites went into elliptical orbit. Using all available data (launch times, release times, applications by SpaceX etc), what are the orbits of all current 300 ...
8
votes
1answer
921 views

Is there any independent evaluation/report on the feasibility of SpaceX going to Mars by 2024?

According to Independent report concludes 2033 human Mars Mission is not feasible An independent report concluded that NASA has no chance of sending humans to Mars by 2033, with the earliest such ...
2
votes
0answers
113 views

SpaceX Crew Dragon depressurization for emergency EVA

As far as I know, the Crew Dragon does not have an airlock. Therefore, if astronauts inside needed to go outside for some reason, they'd need to suit up, depressurize the cabin, and then they'd be ...
14
votes
1answer
2k views

How long can Crew Dragon stay at ISS?

It appears that the first manned Crew Dragon flight to ISS may be extended due to there being only one US astronaut there. NASA is also trying to determine how long Dragon's first crewed mission ...
4
votes
1answer
124 views

Satellite communications interference due to Starlink by SpaceX

As of 8th February 2020, SpaceX has launched 242 Starlink satellites. To what extent will SpaceX's launch of its Starlink satellites affect satellite communications for other satellites? How much (...
4
votes
1answer
157 views

How long does it take to refuel a rocket?

I've been wondering how long the refueling of a rocket, say the falcon 9 takes. That's it.
2
votes
1answer
119 views

Asteroid Mining on Ceres

I am an Architecture and Urbanism student. Currently I am working on designing a space habitat for mineral mining on Ceres. I have been reading about space mining techniques mostly on near Earth ...
5
votes
1answer
162 views

How do ships catch fairings? Can fairings steer or do the ships do all the work?

A comment in The Pod Bay says it all: ...fourth Starlink payload launched. Booster landed on OCISLY. (Has now launched three times, LC-39A, SLC-40, SLC-4W once at each launch pad they own!) ...
5
votes
3answers
453 views

How fast do Starlink satellites (SpaceX new satellites) rotate around the earth?

I'm specifically interested in knowing how long they take to do a full circle around the earth but don't find any info. Could anyone help me?
5
votes
1answer
557 views

Do the latest Starlink satellites use inter-satellite laser communications?

Do the latest (as of Jan 30, 2020) Starlink satellites use inter-satellite laser communications? I can't find any info about that!
2
votes
0answers
47 views

How come the SpaceX fairing doesn't get burned on return? [duplicate]

In the SpaceX January 29, 2020 Starlink mission, the fairing separation happened at the altitude of 104 km, speed 8636 km/h. SpaceX is trying to retrieve the fairing halves and reuse them. 104 km is ...
2
votes
1answer
147 views

How does SpaceX transmit the video feed from the first and second stage cameras back to Earth?

There appear to be at least 1 reasonably high-res (500+ px vertical res) live video stream being transmitted from both the SpaceX F9 first and upper stages all the way up into LEO throughout their ...
5
votes
1answer
245 views

Landing legs problem with Falcon 9 Block 5 / Starlink 3 mission

Is this a late landing burn problem? it seems that the engine touch the OCISLY ground as the landing legs flex. Landing occurs at about T+0:08:20
2
votes
2answers
158 views

How fast could a fully fueled Falcon 9 go to propellant depletion if started in a vacuum

I guess my question is related to somehow assembling and fueling a falcon 9 in LEO then launching it. I would say if all stages were fully fulled and the Merlins were all vacuum optimized. Situation ...
5
votes
1answer
211 views

Does Dragon have any timeframes during launch where there is not a planned survivable abort mode?

The space shuttle had many scenarios with combinations of SSMEs or SRB failures where there was no planned survivable abort available because of a variety of factors (aerodynamics, energy, g forces, ...
6
votes
1answer
256 views

How will the huge SpaceX Starship be moved/ferried on long distances on the ground?

There are evidences that the current rocket by SpaceX, Falcon 9 booster can be ferried on long distances on the regular road network. Long distance road ferry movements seems to be necessary because ...
10
votes
1answer
2k views

After Crew Dragon launch abort, was Falcon 9's detonation intentional?

On 2020 January 19 SpaceX launched the Crew Dragon capsule and tested an in-flight abort, where the capsule separated from the Falcon 9 shortly after launch. Many headlines claim that the Falcon 9 ...
25
votes
4answers
7k views

Why was the SpaceX abort test not initiated by real booster failure?

Today (2020-01-19) SpaceX had a successful flight abort test. As far as I can understand, at a specific altitude, Crew Dragon fired its engines and escaped from the rocket. This test looks like a ...
27
votes
1answer
8k views

How does SPACEX capture such images?

I was watching Today's launch test by SpaceX and had a question pertaining to the method used for imagery of objects mid-air! Other than on-board cameras, what techniques do NASA and SpaceX follows ...
13
votes
1answer
4k views

Why do SpaceX expect the Falcon 9 rocket to explode during the in flight abort test?

This article - https://futurism.com/spacex-blow-falcon-9-rocket-launch/amp - states that after 88 seconds, the first stage engines will shut down, and an automated abort command will be sent to the ...
4
votes
0answers
186 views

What is the mysterious object flying by in this SpaceX video?

In the last second of this video tweeted by spaceX, you can see an object fly by on screen. Did this come from the SpaceX ship, or is it foreign space junk? If it turns out to be the latter, is that a ...
0
votes
1answer
83 views

Comparing Long March 5's CZ-5-300 RP-1/LOX booster to Falcon 9 first stage; similar Isp's but very different relative volumes

Wikipedia's CZ-5-300 and Falcon 9 Full Thrust provide the following rough figures. ...
4
votes
1answer
140 views

Has FCC jurisdiction for all the world for SpaceX's Starlink position?

These days, you can read in the news that SpaceX requested FCC for permission to change the orbit of the Starlink satellites already in orbit. Now... from my understanding, the Starlink satellites ...
3
votes
0answers
39 views

What happens between Payload deployment and the ISS docking

When SpaceX is livestreaming their CRS missions they usually end up by separating the payload from the second stage with an altitude at about 200 km. But I am wondering how the payload gets up to the ...
4
votes
0answers
60 views

SpaceX Dragon Maximum Return Payload

For one of my university courses, we were asked to assess the viability of an asteroid exploitation mission. Assuming that we can somehow mine and refine the material (platinum in this case), we still ...
20
votes
2answers
2k views

How do the Starlink satellites shine?

As we can see the Starlink satellites with the naked eye as they pass by. I was wondering about what makes them visible. Do they have large mirrors that reflect the sunlight making them look as if ...
1
vote
0answers
60 views

What is the surface area of Falcon 9 payload fairing?

what is the external surface area of the payload fairing of the Falcon 9 ?
11
votes
1answer
999 views

What is the density of supercooled LOX at −206 °C, as SpaceX uses it

I want to calculate the size in cubic meters of Starship's propellant tanks. The only figures for LOX I can find are at −183 °C. 1141.7 kg/m³ at −183 °C. Could somebody please calculate it at −206 °C,...
1
vote
1answer
63 views

Two line element set

I was wondering where I could find the TLE of a satellite ( I am looking for CASSIOPE). I went into this link - https://www.n2yo.com/satellite/?s=39265 but it has only got the most recent updated TLE. ...
2
votes
1answer
80 views

Space Debris and Megaconstellations: plans for ~1000kms altitude orbits

SpaceX's Starlink and other mega-constellation plans highlight safe de-orbiting features but does this also extend to altitudes higher than 1,000 kms? My concern is whether these smaller sats will ...
0
votes
1answer
118 views

Can pressure fed engines augment Starship's landing on the Moon?

Can a pressure fed engine be powerful enough to augment the landing of Starship on the Moon? How much thrust is needed to land SS if it’s brought to zero velocity at an altitude of 10 meters? A ...
5
votes
0answers
93 views

How does the SpaceX Dragon nosecone separate?

SpaceX's Dragon uses a nosecone to protect the docking port during ascent. The nosecone seems very large. 1/3 of the capsule's height large. And yet, it separates while the second stage engine is ...
7
votes
2answers
511 views

How fast could the Tesla Cybertruck drive on Mars?

Elon Musk said "Tesla Cybertruck (pressurized edition) will be official truck of Mars". Lets estimate its driving on flat sands to achieve some sort of maximum performance at 0.38 g, 0.07 bar and −70°...
4
votes
1answer
114 views

Cryogenic systems in kwajalein Island- Spacex- falcon 1

Is the LOX (liquid oxygen) required for the falcon-1 launch transported or produced? If transported, how? If produced, did they set up a cryogenic oxygen plant in Kwajalein?
1
vote
0answers
60 views

Satellite spotting

My normal activity in early morning and evening is to count how many satellites I can spot which is between 5-7. At 6 am on 22nd November I counted 51 all in single file some 3 abreast; it was ...
13
votes
3answers
1k views

Why is one Starlink satellite not following the adjacent one in this image?

The following image shows trails of SpaceX’s Starlink satellites as seen in the sky above the Cerro Tololo Inter-American Observatory (CTIO) in Chile: Image Source: SpaceX’s Newly Launched Starlink ...
10
votes
1answer
287 views

Why did the SpaceX Starship MK1 prototype pop?

During a pressurization test on November 20th, 2019, SpaceX's Starship MK1 prototype "popped" at the SpaceX facility in Boca Chica TX. Do we know what caused this apparent failure? Some claim that ...

1
2 3 4 5
21