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Questions tagged [mass]

Questions regarding the mass of spacecraft or other objects

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Has NASA published any information that better quantifies the mass budget requirements for "back to the moon ... this time to stay"?

I'm interested in those elements of their plans that will help me to estimate a yearly mass budget, such as how many crew at a time, how long will they stay each time, how often they will be rotated ...
phil1008's user avatar
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4 votes
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Mass Breakdown of Apollo CSM by Subsystems? (also Cost Breakdown)

I am looking for a mass breakdown of the Apollo Command and Service Module by subsystems, like this Lunar Module's chart from the NASA publication After LM. I am particularly interested in how much of ...
mini earth's user avatar
5 votes
1 answer
147 views

square-cube law and thermal protection tiles (TPS)

Yesterday, I asked a question about the square-cube law and propellant tanks. Do larger rockets tend to have a better mass ratio due to the square cube law? I have a very similar question about ...
Krzysiek's user avatar
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51 views

Hypersonic dynamic shift in large vs. small lifting bodies

Background: Lifting bodies have been tested at small scales, though not during re-entry. For instance: the NASA HL10 Such Lifting-Body designs are seemingly here to stay with craft such as Dreamchaser ...
AnarchoEngineer's user avatar
3 votes
3 answers
1k views

Would orbital ring platforms affect the orbit of a planet?

If we built an orbiting platform of sufficient mass (let's say, made from harvested asteroids) that was anchored at both poles of the planet it surrounded, would such an addition to the planet's mass ...
Dan East's user avatar
3 votes
0 answers
119 views

How do ablatively cooled rocket engines compare to regeneratively cooled ones, in terms of mass?

Assuming equivalent thrust and single continuous burn duration, is there a figure that roughly tells the difference in mass between these two engines cooling methods? This question focuses on first ...
user avatar
1 vote
0 answers
101 views

How heavy is an orbital pogo stick?

Moving people from a A to B in space often requires a significant change in velocity, requiring propellant eating into the mass budget. But most of this propellant is "wasted" in moving a ...
SE - stop firing the good guys's user avatar
8 votes
3 answers
373 views

Do larger less dense objects heat less while entering the atmophere?

When a space craft enters the atmosphere, it gets hot and heat shielding is needed. Do objects with more surface area and less density heat up less then heavier, smaller objects? Could an object with ...
Justintimeforfun's user avatar
5 votes
4 answers
3k views

With increased space exploration missions, are we affecting earth's mass?

This questions may seem naive, but, worth pondering: As humans keep sending more and more missions to space (outside earth's system), the earth is being affected in the following ways: Earth is ...
anurag's user avatar
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Time a rocky satellite in lunar "frozen" orbit spends in Earth's umbra during total lunar eclipse

I am wondering how long a large satellite in a lunar frozen orbit would remain in the Earth's umbra during a total lunar eclipse. The satellite is spheroid with a diameter of 200 km. Let us say that ...
JM Yaden's user avatar
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7 votes
1 answer
303 views

Why will Starlink Gen2 be so big and heavy?

Apparently, the mass of a Gen2 Starlink satellite will be around 1 metric ton. It will also be too large to fit into a Falcon 9 fairing. Given that it's basically still a "flying router", ...
Peter - Reinstate Monica's user avatar
1 vote
1 answer
2k views

What is Rocket Lab Electron's dry mass?

Does anyone know how heavy Rocket Lab's Electron rocket is without fuel? Or do you by chance have any information about the fuel capacity of the first and second stage? I'm trying to model its flight ...
299792458's user avatar
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6 votes
2 answers
257 views

What is the largest possible rocky body? [closed]

Suppose you start with a rocky sphere about 12,742 kilometers in diameter and continuously add more rocky material such that you don't smash this sphere to bits. What is the upper limit for this? ...
Frotz's user avatar
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4 votes
0 answers
90 views

How to estimate total CO2 emission per year due to rocket manufacture?

I'm working on a study on greenhouse gas emissions related to rockets. While I have the post-launch (atmospheric) emissions, I need data for emissions related to production. For example, according to ...
dxcfvgbh cfvgbhnj's user avatar
7 votes
0 answers
544 views

How much does JWST actually weigh?

I recently had to delete my answer to Why doesn't James Webb have a larger supply of thruster propellant? because @NgPh noted: As the last update, JWST weights 6200 Kg. jwst.nasa.gov/content/about/...
BrendanLuke15's user avatar
26 votes
3 answers
6k views

What is the "mass" of a Lagrange point?

Of the five Lagrange points, L4 and L5, as stable points, can be orbited by asteroids, satellites, and any other useful or interesting object. Assuming two-body motion however, calculating orbits with ...
TheEnvironmentalist's user avatar
2 votes
1 answer
656 views

Calculating total burn time for a rocket under constant acceleration with two propellant consumption rates

I tried posting this question on the Physics side of StackExchange but didn't get any response after a week, presumably because it was lost within the broadness of physics in general, so I'm hoping ...
Genso's user avatar
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3 votes
0 answers
324 views

Is there an estimate for the average mass of all meteoroids and asteroids hitting Earth's atmosphere in one year?

I wonder how much mass is entering Earth's atmosphere every year in the form of meteoroids and asteroids. This excludes micro-meteoroids, dust particles, molecules etc. Quick search result talks only ...
Everyday Astronaut's user avatar
5 votes
1 answer
247 views

How long would it take for air to completely leak from a spacecraft?

If a spacecraft of volume V was leaking air of density rho as a mass flow rate of m-dot can you calculate the time for all the air to leak out using (rho x V)/m-dot? rho would decrease and m-dot ...
Jez Turner's user avatar
2 votes
2 answers
307 views

What is inside Perseverance? Is the only scientific payload the bunch of instruments hanging from the arm?

Perseverance weighs about one ton, it is as big as a car. But what is inside the vehicle that weighs so much? Is the payload only the instruments hanging from the arm? Is all the remaining hardware (...
jumpjack's user avatar
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1 vote
0 answers
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How much of a deep space spacecraft's structural mass is useless dead weight after launch? Any plans to shed it in the future?

After seeing this in Security SE Magnetic core memory isn't quite extinct yet. The two Voyager spacecraft used it and are still functional. Core was/is certainly non-volatile. I did some ...
uhoh's user avatar
  • 149k
0 votes
1 answer
251 views

What if we have a DC nozzle instead of a CD nozzle?

My understanding is that the exhaust gas gains velocity as its heat converts to kinetic energy, regardless of the geometry of the nozzle, and the reason we have a convergent-divergent (CD) nozzle is ...
Xi Liu's user avatar
  • 229
2 votes
1 answer
227 views

IMLEO orbit height

Initial Mass in Low Earth Orbit is a well defined cost metric for space missions [1]. However, this is somewhat subjective since it depends on the orbit height. My guess is that there is a ...
Jak's user avatar
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2 votes
0 answers
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mass of the decks in the crewed SpaceX Starship [closed]

I want to work out the approximate mass of a Starship (crewed version) deck. We can assume an internal diameter of 8 meters with a 1.5 meter diameter central support tube. The loading is uncertain but ...
Slarty's user avatar
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4 votes
0 answers
226 views

Is Earth's Moon gaining or losing mass?

The Earth gains mass from dust/meteors (and a tiny, tiny bit to increasing temperatures/energy), but loses mass from hydrogen/helium escaping and nuclear reactions. It's estimated to have a net loss ...
Nate Lowry's user avatar
1 vote
0 answers
213 views

How much did each MarCO 6U cubesat weigh?

Yes the answer is zero now because they are weightless, but I used past tense. In any event, let's try to find a good, reliable source for each spacecraft's mass and whether that number is dry or ...
uhoh's user avatar
  • 149k
5 votes
1 answer
265 views

Why are all possibly habitable exoplanets higher mass than Earth?

I have been writing a scifi book in which I wanted to include real stars and planets as locations. It was simple enough to find a chart on Wikipedia that lists possibly habitable exoplanets, but I ...
TitaniumTurtle's user avatar
9 votes
3 answers
3k views

How close would the Tesla Roadster with Starman have to get to Earth in order to become attracted and fall on Earth?

In 2091 the Tesla Roadster is said to maybe get closer to Earth than the Moon is. At Starman's current speed, would its location in 2091 be sufficient for the Earth to re-attract the Starman to let it ...
user avatar
6 votes
1 answer
2k views

What is the thickness of a rocket nozzle?

For a university project, I'm working on optimisation of a Falcon-9-like launch vehicle, and one element of that is varying expansion ratios of the engines. This will impact on the engine mass, but to ...
Talisker's user avatar
  • 352
2 votes
1 answer
206 views

Is "liftoff mass" = "ignition mass"?

The answer to How much propellant is used up until liftoff? makes me wonder whether the terms "ignition mass" and "liftoff mass" have widely accepted precise meanings. Does anybody have an ...
Everyday Astronaut's user avatar
3 votes
0 answers
70 views

ISS Mass breakdown [duplicate]

I'm looking for some solid numbers that break down the mass of the ISS into functional categories (with the goal of making a neat pie chart). Such categories might include the mass of... Docked ...
Dragongeek's user avatar
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1 vote
2 answers
425 views

Acceleration and reaction mass?

somewhere in a galaxy a long time ago I was informed that accelerating a spaceship at one gravity (Earth value) would result in near relativistic velocity after only one day (Earth value) - I was ...
Brooks's user avatar
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8 votes
5 answers
2k views

Does trajectory of an object orbiting a planet depend on the object's mass? (With hypothetical Apollo example)

For example (hypothetically), if an Apollo crew of one of the lunar missions went on EVA just after Trans Earth Injection burn and carefully released a small bolt, or a plastic package from their food,...
Sergiy Lenzion's user avatar
2 votes
2 answers
324 views

How to use specific impulse for multiple stages

I am given a scenario where I need to create a program to give the initial launch mass of a spacecraft that can vary between 4 and 20 stages. I am given that the "specific impulse for all stages is ...
Scotch Jones's user avatar
23 votes
2 answers
6k views

Is the mass of paint relevant in rocket design?

(Prompted by this answer): Do the designers of large rockets* (have to) take the mass of the exterior paint into account? If so, do we have examples of actual design changes/decisions based on this (...
user avatar
3 votes
1 answer
119 views

How is imbalance handled in the Delta IV heavy?

All the engines of the Delta IV are not ignited at the same time: One of the lateral engine is started few seconds before the other. I imagine there is a good reason for not starting all engines at ...
Manu H's user avatar
  • 3,790
1 vote
0 answers
77 views

Mass/weight information about stage separation mechanism

How can I get mass/weight information about rocket stage separation mechanisms that are used in multi-stage rockets? I plan to create an excel table to compare stage separation mechanisms by weight ...
Faruk UNAL's user avatar
1 vote
1 answer
112 views

Long, low mass data transfer wire options

does anyone have any suggestions for wired communications over long distances on the Lunar surface? The maximum length would need to be around 1km. Distributors like Gore and Axon make great ...
Spuds's user avatar
  • 173
6 votes
1 answer
1k views

Falcon 9: how much fuel is left on a booster after stage separation?

If the booster attempts either land or sea landing, how much fuel (RP-1 and LOX) is left in its tanks right after stage separation? Recently, I have heard numbers as high as 30% of its total tank ...
Everyday Astronaut's user avatar
5 votes
1 answer
466 views

How much mass does a gimbal mechanism add to a rocket?

After reading the question Did any rockets use differential throttling instead of gimbal? I wonder what the additional mass of a gimbal system is. How would the mass of a launch vehicle change if the ...
Everyday Astronaut's user avatar
3 votes
0 answers
74 views

Are there any advantages to being a smaller spacecraft for reentry?

Could a ship drop its cargo or shed weight before reentry to lessen the strain on the ship during reentry? Would a ship breaking down to smaller parts before reentry have any advantages over being one ...
Muze's user avatar
  • 1
6 votes
2 answers
8k views

What is a typical satellite solar panel mass?

Does anyone know a reliable source to find the mass of solar panels on satellites (in particular GEO satellites)? I know they will vary but I am struggling to even find one data point let alone a ...
Jez Turner's user avatar
10 votes
3 answers
3k views

What is the largest and/or heaviest object that could be sent to space?

What is the largest and/or heaviest object that could be sent to space? I know the space station is sent in pieces but I am looking with one launch.
Muze's user avatar
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15 votes
1 answer
677 views

How precisely do we know mass of the ISS?

Everyone knows that in space, every gram counts. Knowing how much mass an orbital object has is necessary for precise motion calculations. So how precisely do we know the mass of ISS? I'm sure we can ...
Euphoric's user avatar
  • 249
3 votes
1 answer
908 views

Does the size of a satellite have an effect on orbit?

I understand that lighter satellites orbits decay faster. There is 2 satellites that weigh the same but 1 is huge and the other tiny in comparison. Would the size of the satellite make a difference on ...
Muze's user avatar
  • 1
6 votes
2 answers
2k views

What size payloads could we feasibly launch from the moon with a mass driver?

I've been wondering how large a payload could be launched & if it's viable to launch those payloads directly to the earth for splashdown & collection. Obviously the payload would need to be ...
Pelinore's user avatar
  • 712
2 votes
1 answer
335 views

Problem in finding propellant mass using rocket equation, where total mass includes components dependent on propellant mass

Formulation: $$e^{\Delta v/v_{exhaust}} - 1=\frac{mass_{fuel}}{mass_{structure}}$$ $$\text{let } k=e^{\Delta v/v_{exhaust}} - 1 \implies mass_{fuel}= k \times mass_{structure} $$ According to SMAD (...
Infi's user avatar
  • 329
6 votes
2 answers
411 views

How much will Europa Clipper weigh?

I realize that NASA will have to change Europa Clipper's loadout based on whether they are launching on the SLS 1b or the Atlas 5 backup, but does anyone know what those two mission masses will be, ...
ORcoder's user avatar
  • 1,033
1 vote
2 answers
1k views

Is centre of mass a factor in space without gravity?

Quick disclaimer; I'm not that well informed on many of the mechanics on space in general so sorry if this question is rather easy/basic. Is the center of mass in a object a factor in space when ...
codedcosmos's user avatar
1 vote
1 answer
601 views

How can I obtain the necessary thrusts / mass flow rates to achieve a given burnout velocity for an optimally staged rocket?

I understand how to use lagrange multipliers to obtain the optimal stage masses given the payload mass, the burnout velocity, the structural ratios of each stage and the specific impulses of each ...
Paul's user avatar
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