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Questions tagged [launch]

Questions regarding the takeoff or the liftoff phase of the flight of a rocket and the set of activities required for preparation of the launch vehicle leading to it.

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1answer
203 views

Why is ISRO's PSLV named “Polar”? Are there challenges for other inclinations?

The "P" in ISRO's PSLV stands for "Polar". Is there anything particularly "polar" about this launch vehicle, or is the use of the word in the name of the rocket more historical or for marketing ...
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1answer
318 views

What are the falling parts in this ISRO rocket launch?

ISRO launched IRNSS-1I satellite yesterday using its versatile PSLV-XL. In the launch video (from 00:35 to 00:40), within five seconds of the launch, many large parts of the rocket are seen to be ...
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2answers
363 views

How to determine rocket launch path for photography?

I want to start space launch photography and have been wondering how to get the path in frame. I have been looking at rocket paths and it seems like there is some kind of navigation that guides the ...
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2answers
1k views

Why are centrifuges not used on the space station? [duplicate]

The low tech county fair ride in the picture below is a centrifuge. How difficult would it be to send modified one like this picture to space? It could spin on non bearing engine indefinably to ...
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1answer
118 views

Control of first stage of shuttle

Why was the launch guidance software of the space shuttle launch between liftoff to SRB separation open loop?
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0answers
36 views

How massive can a planet become before it is impossible to escape from using chemical rocket propulsion? [duplicate]

Assuming a vaguely Earth like world but with higher gravity, at what point is it no longer possible to launch a human being from the surface into orbit? Or anything into orbit?
7
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1answer
236 views

Most orbital launches in one day

There were 3 orbital launches on March 29 2018: Soyuz 2-1v GSLV Mk.2 Long March 3B Is it a record tie for most orbital launches on the same day (as expressed in local time)? If so, when it was set?...
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1answer
96 views

Why does the launchpad strongback outgas 60 secs before launch?

I was watching the live stream of the Iridium-5 / Space-X launch and they mentioned that the strongback would outgas a minute before launch. I assume it was to prevent the strongback from exploding ...
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1answer
193 views

What's up with the “What's Up at Wallops” app?

While reading about the recent Wallops launch for the question Does the Mars2020 lander need a new parachute design? and trying to confirm how to spell Wallops, I ran across the "free What’s Up at ...
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1answer
99 views

‘Times bigger’ meaning? [closed]

When someone says “this star is 10,000 times bigger than the sun”, does that mean 10,000 suns can fit in it or it’s diameter is 10,000 bigger than the sun?
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1answer
3k views

Was SpaceX's launch of Formosat-5 more vertical than normal for any particular reason?

Reading both the abstract and the plain language summary of the recent paper published in the journal Space Weather Gigantic Circular Shock Acoustic Waves in the Ionosphere Triggered by the Launch of ...
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2answers
3k views

Why does InSight plan to launch from Vandenberg

Why does the InSight Mars lander mission intend to launch from Vandenberg, which does not allow for prograde launches? Will it launch into polar or retrograde orbit? Why? It will do an interplanetary ...
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2answers
209 views

Insight mission broken-plane maneuver needed?

Will the Insight cruise stage do a broken-plane maneuver at TCM-2 (or 3), or does the Centaur upper stage have plenty of performance (as I suspect) to directly insert this small s/c into the necessary ...
5
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1answer
224 views

Can (or will) Block5 Falcon 9s be used on the Falcon Heavy?

With the Block5 version of Falcon 9 booster soon to be flying, will they be used for the Falcon Heavy, or will they remain a stand alone thing?
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1answer
272 views

How can I find sources for Launch Trajectories?

The trajectories of space launches and the deployment of their payload (both scientific and commercial) are certainly carefully monitored by the space agency or company providing the launch capability,...
2
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1answer
424 views

Cubesat 6U and 12U maximum weight

What is the maximum weight for 6U and 12U cubesat in kg.? Please, give links/references. In this link it's stated that, 6U is 12kg, 12U is 24kg. But 1U is 1.33 kg, how is it possible?
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2answers
583 views

What is that thing spraying during a Falcon 9 launch? [duplicate]

What are those things spraying something at the pad during the beginning of a Falcon 9 launch?
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1answer
103 views

Were MicrosatA-B represetative of final design for Starlink?

The reason I ask is that when you need to launch 4400 satellites packing them tightly to get as many on a launch as possible is a huge component. The possible numbers were discussed int this question:...
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2answers
248 views

What planning tools and techniques are used to avoid collisions in space during launches?

What tools and techniques are used to calculate as well as to ensure a collision free trajectory when space junk as well as real live useful satellites are so numerous? While the chances of hitting a ...
38
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1answer
8k views

Why did the Tesla Roadster spend time in the Van Allen belt?

Following the Falcon Heavy launch, the second stage + Roadster payload spent a number of hours 'drifting' through the Van Allen belt before performing the burn to put it into its current orbit. Elon ...
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1answer
603 views

Why do we see smoke before ignition of Falcon Heavy? [duplicate]

We can see smoke at some regions before the main ignition takes place. Why is that?
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1answer
151 views

What is pictured in the back of Falcon 9's 2015 launch photo?

Wikipedia (actually Wikimedia) has an image of Falcon 9's 2015 launch during its night flight (16th flight in total) that took place on Sunday, March 1, 2015 at 10:50pm ET: I was wondering what is ...
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3answers
9k views

Is a SpaceX launch completely automated?

Once the engines are ignited and liftoff occurs, are any operators/controllers on the ground making any manual changes to the flight? Or are they simply monitoring the entire event until the boosters ...
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2answers
542 views

Why does NASA still use film cameras?

According to this video, NASA still operates some cameras for tracking rocket launches that use film: According to NASA, they even have some film cameras placed around their launch site loaded ...
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4answers
6k views

Why do they put a timeline on the Space X launch videos?

I have never noticed the Space X rocket launch videos include a timeline. This image is from the Falcon Heavy launch with the Tesla car in it.
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2answers
187 views

Will there be no other test flights of Falcon Heavy?

In this list of Falcon launches, the next flight of a Falcon Heavy in June 2018 will transport several scientific satellites. The mission will be part of the certification process of the new rocket. ...
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2answers
685 views

Capacity of the BFR tanker — how many flights to fully refuel the spaceship?

So, the current plan for the BFR has the spaceship massing 85 tons and carrying 50 tons of cargo plus around 1000 tons of fuel and oxidiser (according to wikipedia), most of which is presumably ...
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1answer
148 views

Is Engine thrust noticeably increased near the ground

I know next to nothing about Rocketry and Space Flight. I assume that the majority of the force generated by a rocket's engine is simply the result of throwing gasses out of the bottom very fast, and ...
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3answers
5k views

Could a Falcon Heavy test flight be responsible for these observations?

We observed a bright, slow moving (in our view for several minutes) large object that eventually left large bright contrails. This was over Northern New Mexico at around 7:29 PM MST. The object was ...
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1answer
1k views

Just how much of the Falcon Heavy is reusable?

I've been looking for just this one bit of info, in all the press: exactly how much of the Falcon Heavy is recoverable and reusable? Obviously not the fuel, but is all the hardware recovered? If so, ...
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1answer
1k views

Starman's Tesla prelaunch preparation

How did they prepare the Tesla before launch? At minimum did they deflate the tires? Removed all liquids and batteries? What about all the materials used on it?How will they react to such friendly ...
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1answer
4k views

How deep into space will the live feed from Starman remain active?

Assuming they keep it streaming for us to watch, at what distance will it no longer broadcast?
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2answers
19k views

If Starman is heading to Mars, why is he still spinning so we see the earth?

If Starman is heading to Mars, why is he still spinning so we see the earth? Shouldn't he always be pointing away from the earth?
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1answer
303 views

Are Falcon Heavy's side boosters aerodynamically detached?

During SpaceX Falcon Heavy test launch live stream, it's been said, just after boosters engines cutoff, the pneumatic separation system on the centre core will unlock the two side boosters and ...
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4answers
40k views

What was the fate of the main core of the first Falcon Heavy launch?

February 6th 2018 saw the first test launch of SpaceX's Falcon 9 Heavy rocket. During the main core's landing on the marine landing pad, the connection was lost. As such it is not immediately clear ...
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3answers
7k views

Why is there any launch window at all for the Falcon Heavy test flight?

Why is the window only ~3 hours long, why not 2? why not 5? why not "until it launches"? I'm guessing range safety, they could only get a TFR that long?
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0answers
287 views

How to view the Feb 6, 2018 Falcon Heavy launch?

Will the Feb 6, 2018 Space x Falcon Heavy launch from KSC be visible in Boca Raton/ Deerfield Beach area? Is there a good site for determining viewing ranges for launches?
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3answers
2k views

Why is the Falcon Heavy first launch being given such a risk of failure? [closed]

Why is there is so much fuss about Falcon Heavy exploding on the way? I don't understand why would they purposely design a rocket having a good chance of explosion during launch. If they are not ...
32
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3answers
5k views

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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3answers
2k views

Why won't Falcon Heavy launch with 100% thrust?

The crossfeed system is not yet realized for Falcon Heavy. Instead, the central booster will throttle down after liftoff and resume "full thrust after side boosters separate" Why would one do that ...
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8answers
12k views

Why is the first launch of Falcon Heavy sending a car instead of something useful?

The first launch of the new Falcon Heavy will be sending up a Tesla Roadster owned by Elon Musk as its payload instead of something more useful. Why spend all that money and effort sending up a car? ...
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0answers
195 views

For a launch, how is safe viewing distance determined?

In determining safe viewing distance, seems to me there are discrete threats to consider: First is the rocket blowing up on the pad, or just above it. That would have no warning. There would be a ...
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3answers
3k views

Will the Tesla Roadster return any telemetry?

Is there any equipment fitted to the Tesla Roadster to send signals back to Earth, even for a short time after launch?
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3answers
4k views

Why does the Falcon Heavy Rocket have a higher payload than the Space Shuttle?

The Falcon 9 heavy rocket has a thrust of about 5,340,000 pounds (23700 kN) with a LEO payload of 140,660 pounds (65.7 t). The Space Shuttle, on the other hand, had a thrust of 6,780,000 pounds (30000 ...
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3answers
424 views

Why JAXA's tilted launch from a tilted rooftop?

According to the just posted NASA Spaceflight news item Japanese sounding rocket shoots for record-breaking orbital launch: Japan conducted another attempt to launch a miniature satellite via a ...
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2answers
2k views

What's the reasonable “window” in days for a Mars-Earth Hohmann transfer?

As any popular science reader knows, when traveling between Earth and Mars, there's a Hohmann transfer opportunity about every two years (I believe it's every 26 months, specifically). What I've ...
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2answers
2k views

Is the Falcon Heavy as loud as the Space Shuttle or Saturn V?

Is the Falcon Heavy Rocket as loud as the older Saturn V and Space Shuttles? I have read that Saturn V and the Space Shuttle were within a few decibels of each other. The newer Shuttle was slightly ...
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0answers
1k views

How far does the sound of a rocket launch carry?

Having never been to a rocket launch, can you tell me how far the sound carries? I can hear the rumble of F-15 Eagles take off from inside my office building five miles from the airport. An F-15C is ...
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2answers
4k views

Will the James Webb Space Telescope be insured against launch failure?

Most commercial satellites are insured in case something happens on launch. Although the Ariane 5 is a fairly reliable rocket, a launch failure is not out of the question. While other questions have ...
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2answers
677 views

Could an Orion Spacecraft launch from a Falcon Heavy? [duplicate]

The cost of an SLS launch is significantly more expensive then a Falcon Heavy. Could an Orion spacecraft be mated to the Falcon Heavy to save launch costs?