Questions tagged [landing]

Questions regarding the specific part of flights, during which a spacecraft touches down on the solid ground of a celestial body.

Filter by
Sorted by
Tagged with
7
votes
1answer
268 views

Did Yuri Gagarin really telephone officials in Moscow to come pick him up?

A farmer and her daughter observed the strange scene of a figure in a bright orange suit with a large white helmet landing near them by parachute. Gagarin later recalled, "When they saw me in my ...
18
votes
1answer
1k views

Did any of the Space Shuttles land through rain or rainclouds?

My web research resulted in figuring out that launching Space Shuttles in rain, apart from lightning, wind and turbulence related problems, wasn't permitted due to: brittleness of the heat shield ...
5
votes
1answer
161 views

What specific event determined the “end” of a shuttle mission?

We've had several questions about when a mission officially "begins". But what about when a mission officially "ends"? The Apollo Flight Journal stops the mission clock at splashdown. What was the ...
18
votes
4answers
4k views

SpaceX first stage landing: Why not use an elevated net above the landing platform to catch the rocket?

The rocket would keep same descent system as now (no parachute). But instead of landing on feet, it would have long grid fins on its top that would be catched by an elevated cable net. The previous ...
1
vote
0answers
33 views

Why did SN10 rest at a slight incline after landing? [duplicate]

Recently when SpaceX's SN10 landed, before it exploded, it sat still on the ground for a few minutes. It appears to be resting at a slight incline. Why is this?
6
votes
2answers
447 views

How tall are the “cliffs of the delta” in the Perseverance rover's landing ellipse?

edit: For all the cliff-doubters in comments, here's a quote of Project Scientist Ken Farley in the new NASA video After the Landing: An Update about NASA’s Perseverance Mars Rover after ...
30
votes
7answers
7k views

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 ...
56
votes
4answers
9k views

How were Perseverance's cables “cut” after touching down?

In the NASA conference today regarding Perseverance's successful landing on Mars, they talked about how you can see the cable that held the rover in this picture below (I circled the cable). I'm ...
-7
votes
3answers
176 views

Why did the communication cable of the Perseverance rover make an angle so great with the other three cables? [closed]

How can you explain the weird position of the communication cable in the image below? The Perseverance about 20 meters above the surface of Mars. The communication cable, between the rover and its ...
3
votes
1answer
123 views

How many spacecraft bounced like a ball on Mars? How many tried to?

The answer to Why a rover bounces after landing on Mars? is "the Mars Exploration Rovers" of which there were two. However, they might not be the only spacecraft to use bouncing like a ball ...
-3
votes
4answers
419 views

The Mars parachute opened against a black sky on Earth but a blue-magenta sky on Mars during Perseverance landing. How is it possible? [closed]

I have discovered two images (see below) and I do not find an explanation for the different color of the sky as seen from below the parachute just starting to deploy. The video with the test performed ...
0
votes
2answers
158 views

Why a rover bounces after landing on Mars?

Sometime ago I was watching a video which showed that when a rover lands on mars surface it will keep bouncing on Mars' surface like a ball until it gets rid of energy and then it becomes static. But ...
-3
votes
3answers
232 views

A mysterious flash of light on the surface of Mars while the Perseverance rover was landing. What can it be? [closed]

A mysterious light that lasted a fraction of a second appeared on the surface of Mars while the Perseverance rover was descending. What can its source be? See: Perseverance Rover’s Descent and ...
6
votes
0answers
55 views

What are the rules for callouts during mission landings?

I remember hearing at one point that in the control room at JPL, only the GN&C Lead is allowed to make the announcement for touchdown. It's because they don't want someone prematurely (and ...
16
votes
1answer
1k views

Are launch windows to Mars avoided if they result in landings during dust storm season?

This comment suggests that orbit before descent to Mars' surface allows a mission to delay the landing if the weather conditions are bad. I think that Tianwen-1 will be the first to put a lander rover ...
1
vote
0answers
128 views

Has any spacecraft attempted to land on Mars without an ablative-type heat shield?

My answer to Do exploration spacecraft enter Mars atmosphere against Mars rotation, or on the same direction? lauds the use of ablative heat shields for minimizing radiative heating of a spacecraft by ...
5
votes
1answer
189 views

SpaceX Starship: Could they use the Vacuum engines during landing in case of other engine failure?

With the recent test (and RUD due to single engine relight failure) of SN-9, Musk has stated that what they should've done was light all three raptor engines simultaneously then turn one off so as to ...
1
vote
1answer
112 views

How long is Falcon 9 suicide burn?

My question is How long is a Falcon 9 suicide burn? I assume the answer might vary between rides, depending on the payload lifted and its destination orbit so the time might not be the same for a ...
6
votes
1answer
153 views

What is the heaviest object to have been returned to Earth with a parachute?

Per What were the biggest and heaviest spacecrafts to safely return from orbit?, the biggest and heaviest spacecrafts to safely return from orbit were space shuttles and space planes. What were the ...
4
votes
2answers
165 views

How was an emergency landing site at Diego Garcia used during the Apollo program?

On the current Starlink mission as the 2nd stage passed over the Indian Ocean I heard mention of contact with a ground station at Diego Garcia. Checking that article I found the subsection Space ...
4
votes
1answer
209 views

Starship deceleration during belly flop?

Was just wondering what level of deceleration did they get during that belly flop manouver? Updated: Hiya, you're all correct, and I was a tad vague in my question! What I'm after is the vertical ...
8
votes
1answer
448 views

Can the space shuttle use OMS engines during landing?

Can the space shuttle use its OMS engines if the shuttle is short during the runway approach? Is fuel available for use in such a situation and will the engines provide reasonable thrust to get to the ...
3
votes
0answers
48 views

How to get MSL coordinates during EDL from SPICE kernel?

Upon trying to extract MSL position above surface by decoding a SPICE kernel, I am gettin this error: At epoch 3.9750216818313E+08 TDB (2012 AUG 06 05:16:08.183 TDB), there is insufficient ...
1
vote
0answers
18 views

Falcon 9 Stage 1 Guidance After Separation?

Does anyone know how stage 1 of Falcon 9 is guided immediately after stage separation? I'm not interested at this point in getting it to a precise landing spot, nor am I interested in the landing ...
4
votes
1answer
77 views

Does the SpaceX Falcon 9 first stage fleet, fly in order?

SpaceX by the end of 2020, made it very clear that they have solved the first stage reflight problem. Two cores have flown 7 times. Several are over 4 flights. At the beginning of 2021 they have about ...
2
votes
2answers
242 views

Can the Space Shuttle land on Mars assuming there is a paved surface for landing?

Can the Space Shuttle land on Mars if it had a paved runway? Can the Space Shuttle use aerobraking and will its control surfaces provide attitude control? Can the parachute and braking systems stop ...
3
votes
1answer
89 views

Besides landing several folks on the Moon and returning them safely to the Earth what criteria did Human Landing System proposals to NASA meet?

The new NASA video NASA 2021: Let's Go to the Moon shows artwork for three very different spacecraft sitting on the lunar surface with the overlain caption Selecting A Human Landing System "...
1
vote
1answer
131 views

Can Starship use dedicated smaller auxiliary landing fuel tanks?

Would it be better for Starship to have a separate set of small fuel tanks dedicated to landing the ship, maybe controlled separately or plumbed differently.
15
votes
1answer
964 views

What is the value of the cross-track angle between the two designated CRS-4 first stage recovery zones?

For the SpaceX Falcon 9 launch on its Dragon/CRS-4 cargo delivery mission to the International Space Station, according to Spaceflight 101, two downrange safety zones have been identified: The SpX-...
7
votes
1answer
99 views

Is there possible engine damage without launch platform on Mars return flight?

When a Starship has landed on Mars, there is not going to be any kind of prepared platform initially. (That may be a task for early crews to resolve). Is there the possibility that Starship, sitting ...
71
votes
5answers
11k views

Difference between BlueOrigin and SpaceX rocket landings?

So, SpaceX has finally landed their booster back to the land. BlueOrigin has achieved the same thing in a recent past, but I have read so many people commenting and criticizing the comparison of ...
6
votes
2answers
720 views

How many burns does New Shepard have during a descent?

The Falcon 9 first stage is making two or three burns for descending: boostback burn (optional, depends on return to launch site vs ocean landing) entry burn landing burn But how many burns is the ...
11
votes
1answer
281 views

What caused STS-129's low energy condition on the HAC?

I've never heard anyone comment on the trouble STS-129 seemed to experience during the Heading Alignment Cone (HAC) phase. I was hoping someone who was involved with the program might know why it ...
11
votes
2answers
2k views

Land a cubesat on the moon with ion engine

Say I have a 3U cubesat with a BIT-3 ion thruster, an iodine tank and landing legs. Can it land on the Moon with just an ion thruster?
5
votes
1answer
189 views

Can the grid fins affect the rotation of the Falcon 9 descent?

Can the grid fins control the rotation of the Falcon 9 on descent? How would they have to be positioned to stop the rotation? If used to rotate the ship, then how they would they have to be positioned ...
4
votes
0answers
197 views

How heavy is SpaceX's Octagrabber?

SpaceX's drone ships have a vehicle that drives under a booster after landing and then clamps onto it to secure it. Photos of it suggest that it has neither ballast nor any way to clamp onto the ...
2
votes
0answers
99 views

Could SN8 miss its “bellyflop” if Center of Gravity is too far forward?

Very excited about the upcoming Space X Starship SN8 test flight, but was concerned about the ability to perform the high drag horizontal belly flop with some of the rocket thruster hardware missing ...
21
votes
5answers
4k views

Which astronauts or cosmonauts were injured by a hard landing?

Sigmund Jähn, the first German in orbit, was injured during a hard landing of the Soyuz 29 capsule on September 3rd, 1978. He got permanent damages of his vertebral column. Are there other astronauts ...
13
votes
3answers
4k views

Did Apollo have braking rockets for soft landing on Earth?

Did Apollo have braking rockets for soft landing on Earth? I have checked Google but cannot find an answer.
1
vote
1answer
97 views

Falcon 9 landing stages

I know the first stage of Falcon 9 separates at about 2:30 min and it lands at about 8:30 min But what are the distinct stages of the descent? Like deorbit burns, grid fin deployment, leg deployment ...
1
vote
1answer
85 views

How long it takes for the Falcon 9 payload fairings to reach the sea?

The payload fairings of Falcon 9 are released at about 3:15 min How much time they need to fall and reach the sea? And what is their maximum speed while reentry?
43
votes
4answers
10k views

Why was Venus rather than Mars targeted for the first interplanetary landings?

This is a question about early planetary missions. It looks like there was only one early (unsuccessful) landing mission to Mars and that subsequently Venus became the target for interplanetary ...
7
votes
1answer
202 views

Why was the shuttle landing crosswind limit reduced for longer missions

Answering a question about inclement shuttle landings, OrganicMarble quotes from a summary of landing rules: The peak crosswind cannot exceed 15 knots, 12 knots at night. If the mission duration is ...
3
votes
2answers
472 views

Is helium used to power the Falcon 9 grid fins?

Is helium used as a hydraulic fluid to power the grid fins? Or for engine gimbaling? What are the pros and cons of using helium instead of hydraulic fluids?
2
votes
0answers
48 views

What is the splash down speed of the manned dragon capsule?

What's the rated speed of the crewed dragon capsule? Do we have any data on the actual measurement for the demo mission? I'd also appreciate any info on speed for Soyuz, other soviet manned, Apollo, ...
18
votes
4answers
3k views

Is there a risk that re-entering capsules or other components will hit ships or islands?

How precisely can the splash-down point of re-entering capsules (from Mercury onwards) be known in advance? Wasn't there a risk that capsules would hit a ship or an island? Likewise, Russian and ...
0
votes
3answers
158 views

Are Falcon 9 1st stages now always landed at sea?

Does the first stage of Falcon 9 now always land on a drone ships at sea? Say since 2016 or so.
5
votes
2answers
141 views

Could Crew Dragon Make an Emergency Landing on Land?

Could a capsule designed for ocean splashdown still land successfully on land in an emergency? The speed of the capsule is slowed to ~15 MPH, which seemingly wouldn't destroy the capsule.
4
votes
2answers
307 views

Landing shock of Soyuz spacecraft?

Every astronaut launching on a Soyuz has a custom-made seat. The seat should prevent injuries from the very hard landing. Are there any numbers about the maximum decceleration when hitting the ground?
3
votes
1answer
106 views

What are the main stages of a Crew Dragon descent?

From answers to How much time it takes for the capsules to descend from ISS back down to Earth? I understand it takes 19 hours from the undocking from ISS until it touches the land. But what are the ...

1
2 3 4 5
7