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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187 views

If the Earth spun clockwise, would Florida have still satisfied the requirements for the US launch center in the 1960's?

In a comment under the question If the Earth spun clockwise, how would that affect Space Exploration? I wrote: Kennedy Space Center would be a lot closer to JPL; not sure what all happens with the ...
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What is the farthest distance a failed rocket has landed from its launch site?

What is the greatest distance from its launch site that a failed rocket (or its debris) has landed? Failures only. This excludes surface-to-surface or surface-to-air missiles, which are intended to ...
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Why do space rockets not start from an angle? Why go straight up? [duplicate]

I know that they used to have this idea, back in the day, of a "space gun" to fire somebody into space, and I understand why that was not safe or practical/feasible. However, once they had come up ...
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How many stages were used to put Iran's satellite NOUR 01 (45529) into its orbit?

Fox News' Iran-launched military satellite entered Earth's orbit, US Space Command announces says: “Iran’s first military satellite, Noor, was launched this morning from central Iran in two stages. ...
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Which kind of launch vehicle has put the most total payload mass in space?

Examples of "kinds of launch vehicles" include Ariane 5, Electron, Pegasus, Falcon 9, Space Shuttle, Saturn V, etc.; small variations shouldn't be counted as separate. Question: Which kind of launch ...
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What makes SpaceX's Starship so cheap?

Elon Musk estimates that a Starship launch could drop to as low as $2 million. A Falcon 9 launch costs $50 million (when reused). What makes such a huge price difference? Will it use a different ...
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How much of the Apollo gantry, tower, and pad were destroyed on each launch? How much could be reused?

I have often seen various videos showing the huge fireball beneath a Saturn rocket launching. But I have not seen video or photos of the aftermath. Was the gantry, ...
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294 views

How and/or why did Elon Musk mistweet Roadster's C3 so badly?

In this answer to How close would the Tesla Roadster with Starman have to get to Earth in order to become attracted and fall on Earth? I just wrote: When Roadster was launched from Earth Elon Musk ...
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What does “That's how we drive to 48!” mean?

The video in this 27-Oct-2017 45th Space Wing tweet uses the phrase "That's how we drive to 48!" What does it mean? T-3 days: Our 45 Operations Group is ready to take on this Epic Launch from the ...
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How are satellites, rocket launches and other space programs affecting the earth’s rotation? How will it be affecting living beings?

Want to know the effects of the active satellite, rocket launches and space programs that affect earth rotation? how? And their effects on living beings due to effect in earth rotation?
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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 ...
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What is the source of the 'whoop' sound made before the liftoff (T-3s) of Atlas-V rocket?

For reference, you can hear the distinct 'whoop' sound at T minus 3 seconds mark of the recent TDRS-M launch. This sound has been distinctive for most previous Atlas-V launches as far as I can ...
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For a 3 booster rocket, why do they start with igniting the starboard booster, followed by the center and port?

In today's launch of the Delta IV heavy, it was stated that the starboard booster rocket would be ignited first, followed by the port and centre boosters. I would have thought this would give some ...
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Launch options for a hobbyist cubesat builder who's not rich? [closed]

For a while now I've been waning to launch a satellite into space, making the satellite should be simple enough, I have some experience with Arduino and coding in general. but what I don't have is any ...
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How much propellant is used up until liftoff?

How much of the total propellant mass (fuel+oxidizer) of the first stage/boosters is usually burnt between ignition and liftoff?
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What rocket uses the largest percentage of Fuel/Oxidizer before liftoff?

inspired by this question: How much propellant is used up until liftoff? which asks how much propellant (fuel/oxidizer) a typical rocket uses before liftoff. What has been or is the most non-typical ...
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604 views

Rocket to launch 8 cubesat to LEO at an equidistant distance

I am working on a project, which consists of the launch of 8 cubesat 1U to LEO (Low Earth Orbit) and I started working on the launch part, the idea of ​​the project is to be as cheap as possible, the ...
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How do launches avoid leap seconds? Why?

A short comment in the BBC Crowd Science audio program Does Time really Exist?'s discussion of the slow divergence between UTC and TAI (IAT) (coordinated time and international atomic time) says that ...
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170 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?
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How does Indonesia's development and test vehicle work? Could something like this reach space or even orbit when scaled up?

Phys.org's Blast off: space minnow Indonesia eyes celestial success says It's a very long way from a Mission Control in Houston, but the Southeast Asian archipelago's answer to NASA has big hopes and ...
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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 ...
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Looking for ICS information at common launch facilities

I'm doing some research on cyber threats to launch facilities, such as those against industrial control systems leveraged by a typical launch service provider. Details of which types of systems are ...
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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 ...
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Launch to orbit delta-v penalty from Venus compared to Earth?

Thinking about the no atmosphere caveat here made me think of Venus, which is the opposite of no atmosphere for solid/rocky bodies in our solar system. Earth's low orbital velocity is about 7.8 km/s. ...
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What dangers are on a launch pad after a successful launch?

I was looking at some pictures of launches (like this one) and started looking at the stairwells, doors, and other places people are intended to go. It got me wondering what kind of dangers exist on a ...
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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 ...
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Calculating Apollo launch azimuth

The launch azimuth for Apollo missions to the general area of the lunar equator was approximately 70 degrees. Could someone explain in simple terms how this figure is arrived at? I presume that if ...
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Would wind shear or other atmospheric conditions delay a rocket launch FROM the surface of Mars?

On earth we have launch windows because of this and constant weather monitoring is needed right up until launch. Would this be required on a return trip from Mars given that the speed of the wind on ...
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How has the angular velocity of Earth changed over the past 100 years?

What is the total change in the Earth's Angular Velocity over the past 100 years? I have read other posts that discuss how much mass has been lifted out of Earth's Atmosphere. I'm trying to get an ...
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Why do panels fall off of Arianes 1-4 on launch? [duplicate]

I hope this isn't a duplicate. In earlier Ariane rockets, there's a lot of panels which seem to fall off of the interstage immediately upon liftoff, exposing a highly reflective surface. Source: ...
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Can I push the atmosphere out of the way?

The problem with virtually all methods of giving a launch vehicle velocity before launch is the atmosphere. The higher the velocity, the worse the drag. In the comments to a recent question, someone ...
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What would a human rocket be like to launch a human off Mimas?

In a comment on Is there a self-rounding celestial body from which an Olympian could jump into space? @jpa made a modest proposal. What if we stacked a bunch of athletes on top of each other and ...
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Could a human jump off Mimas without return?

A similar question has already been asked on dwarf planet Ceres: Could a Human reach escape velocity by jumping from the surface of Ceres (a dwarf planet)? Ceres has 2.9% of Earth's gravity. Saturn's ...
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Non-orbital takeoff and landing?

I know it is a naive question, but somehow I couldn't find where it is answered here earlier. There have been a number of questions and answers detailing how spacecraft need to achieve high orbital ...
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How does the roll maneuver allow more mass to be lifted into orbit?

I read recently that the roll maneuver that rockets perform shortly after clearing the tower to become tilted serves a few purposes (Shuttle and Apollo Saturn V alike). I understand most of these ...
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Is there any advantage in launching spacecraft from a high latitude, or why was Plesetsk built so far north?

For launching satellites or other spacecraft, there is a significant advantage in being close to the equator: angular momentum helps in gaining initial speed and one can launch into any inclination. ...
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Cubesat/Nanosat dispensers/deployers costs

I’ m looking for informations about dispensers/deployers equipement costs and associated launch costs, espacially for 12U configurations and over. I’ve got price information on Tyvak 12U Deployer in a ...
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Why does launching east result in an orbital inclination equal to the latitude of the launch site?

As mentioned briefly in this answer and this Everyday Astronaut video: And just as a reference, if you launched straight east out of Kennedy Space Center, you'd be on a 28.6° inclination which you ...
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Cost of launch unrelated to cost of building rocket

ULA CEO Tory Bruno said long time ago that only 1/2 cost of orbital launch is cost of building of rocket. SpaceX never denied this. F9R block 5 total cost of launch can be about 60-80 million per ...
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How are rocket launches scheduled?

With all the satellites and other objects already in space; how exactly are launches scheduled and coordinated? Is there some kind of clearinghouse? How do the mega constellations affect the ...
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Why can't we launch from space?

So this may be a stupid question but I was wondering why we couldn't launch from space. I know that most of the fuel that we spend is for escaping Earth gravity. Yet, if we have already done this with ...
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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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How high will the Crew Dragon capsule get during the In-Flight Abort?

During the In-Flight Abort test (IFA), the Crew Dragon capsule will pull away from the Falcon 9 rocket when the rocket is undergoing maximum aerodynamic stress. At that time, it will still be going ...
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Why aren't sea launches used more often?

I was reading yet another awesome Tildal answer, and this picture caught my eye:        Zenit-3SL carrying Atlantic Bird 7 lifts off from Odyssey platform (Source: The ...
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Why doesn't the US use European rocket engines?

US Companies have been using Russian rocket engines for their rockets for a long time, even during sanctions. But as I was going through the European rocket launches, I felt European rocket engines ...
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How did Gemini/Agena rendezvous?

From this Wikipedia article, the time to launch between the two missions was 1 hour 41 minutes (15:00 and 16:41 UTC, respectively), which is pretty much 1 orbit in LEO. That would give a nodal ...
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What does S represent in Chris Hadfield's D = ½ ρ v² S?

Retired test pilot, CSA astronaut and ISS Commander Chris Hadfield's new Master Class advertisement video Chris Hadfield Teaches Space Exploration - Official Trailer - MasterClass is heavily edited ...
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Why not travel to Mars in 2 months?

Just to clarify... I've made some research and generally know what the case is, didn't mean to make the question sound stupid... :) I know there is a thing called Hohmann transfer orbit, named after ...
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What is the white vapor seen immediately prior to and during the early part of the launch? [duplicate]

As most modern rockets rest on the pad much white vapor is seen. Is this propellant being vented or condensation from the surrounding air due to the extreme cold of the rocket body?
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Why is there a “coasting” phase in some space launches?

During the PSLV (India's Polar Satellite Launch Vehicle) C24 launch on 4 April 2014, once stage 3 (PS3) had burned out, it wasn't immediately jettisoned, but instead there was a coasting phase for ...

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