All Questions

1
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0answers
40 views

How does the New Shepard Crew Capsule trigger retropropulsion just before impact?

How does the New Shepard Crew Capsule trigger retropropulsion just before impact? GIFs from Blue Origin NS-10: New Shepard launch & landing, 23 January 2019 For example, Soyuz uses a gamma ray ...
1
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0answers
45 views

Has Space-X been communicating with the German SHEFEX program about their actively cooled heat shield tests?

The German SHarp Edge Flight EXperiment has used some sounding rockets to test aerodynamic control surfaces during hypersonic reentry. The nose consists of thin ceramic plates bolted to aluminum with ...
3
votes
2answers
54 views

How to obtain Chebyshev coefficients directly from the JPL Horizon's interface?

I'm from Spain and I'm currently finishing my degree in Aerospace Engineering. I am starting with all of this. My objective is to obtain the Chebyshev coefficients for the major planets position, ...
2
votes
2answers
135 views

Do horseshoe orbits have anything to do with Lagrange points? Do words fail us here?

I said (2010 SO16 is associated with Lagrange point L3 but wanders so far behind and ahead of it that the orbit is called "horseshoe"... and the comment was made: Not really. L3 is unstable. ...
1
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0answers
14 views

What's up with Brazil's ASTER mission? Is it still scheduled to launch in June 2020?

This answer says: Brazil is currently planning its first deep space mission to the triple asteroid 2001 SN263. The mission, named ASTER, has a launch opportunity in June 2020. and links to ...
2
votes
0answers
67 views

How many people could the ISS support?

How many people can fit on the ISS? At what person would life support be overwhelmed?
0
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1answer
107 views

Fuel vs food on the trip to Mars?

How much food for each person is need and fuel per various engine to go to Mars on the current 9-month trip there then 3 months on Mars and the 9 months back? Can time be saved on the trip to and from ...
1
vote
1answer
62 views

Maximum size for a Ion thruster solar array

In other questions I have asked about using a solar sail to double as a reflective mirror to provide light to an ion engine. What would be the maximum size or surface area of a parabolic sail where ...
2
votes
3answers
145 views

Instead of approaching Mars from behind can we approach Mars from the front of its orbital path? [closed]

Nine months is what google maps said to get to Mars. I would like to know if fuel was no expense how long could we get to Mars other than the method below? Is the 9 months and the method just what our ...
0
votes
2answers
76 views

What is a safe speed in space for spacecraft?

Does traveling fast as possible shortening the duration of the mission lessen chances of collision or mechanical failure, or does traveling slower in space in some way safer?
1
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0answers
50 views

Question about line-of-sight on a flat earth [closed]

If the Earth were flat - could you (on a crystal clear day) see the Himalayas from the UK? (Assuming there were no obstructions in between) And secondly - would the view into space be any different?
8
votes
1answer
400 views

Why no Iridium-level flares from other satellites?

Wikipedia explains Iridium and other satellite flares very well. The Iridium reflective surfaces are at very particular angles and can flare up to magnitude -9.5, however other satellites don't ...
1
vote
0answers
27 views

Water for shielding during space travel [closed]

Use less water for shielding during space travel by transferring water to the side of the craft exposed to the solar radiation source?
3
votes
1answer
58 views

How to calculate angle in elliptic orbit?

I would like calculate angle in elliptic orbit ZCP at any time, where: Z (position of periapsis), C (center of ellipse), P (current position of planet). I find topic, where is picture (in accepted ...
2
votes
4answers
275 views

What if the Shuttle went straight up?

It seems like Space Shuttle vehicles ascend on a diagonal in order to enter orbit. However, what would happen if they just kept going straight up?
1
vote
0answers
28 views

If gravitational waves exist. Do anti gravitational waves exist [closed]

If gravitational waves exist. Do anti gravitational waves exist. And could they also be detected using a liegar detector. And if gravitional waves exist when 2 masses are combined e.g two black holes. ...
2
votes
0answers
20 views

What are Other Galaxies made of? Are they different than our own? [closed]

Does NASA use a spectrograph to see what other Galaxies are made of? If they do has NASA discovered other Galaxies that are made of different Elements than our own?
2
votes
0answers
38 views

Cooling jacket calculation issue [duplicate]

I'm going through How to Design, Build, and Test Small Liquid-Fuel Rocket Engines. The reference explains how to calculate the water flow gap for the cooling jacket that surrounds the combustion ...
4
votes
0answers
44 views

What type of Kalman filters are preferred for satellite ADCS systems; what are the tradeoffs?

Are Unscented Extended Kalman filters (UEKF) preferred over Multiplicative Extended Kalman filters (MEKF) in satellite ADCS systems? What are the trade-offs for these two filters? I have read that ...
2
votes
1answer
44 views

Globally extensive overview of rocket startup companies

Is there any known report, website or other source from where one can get a comprehensive overview of almost all startup companies related to space rockets or hardware that's dedicated to space ...
7
votes
2answers
159 views

What is the point of launching EM-1 on DIVH/F9H?

EM-1 was originally a full-up test of the SLS block 1B: Orion, ICPS (a modified 5-meter Delta cryogenic second stage), and the first stage/SRBs. NASA administrator Bridenstine’s statement on 3/13/...
1
vote
1answer
116 views

If a MarCO-type CubeSat were in orbit around Bennu, what kind of power would it need to communicate with the Deep Space Network?

This is a follow-up question to: What is the lowest power signal that the DSN can detect? Essentially, I have determined that the asteroid Bennu (ranging from 25 to 350 million kilometers from Earth) ...
1
vote
0answers
30 views

How much of the piggybacked Aireon system rely on its Iridium Next hosts?

The NBC News article Next-generation satellites gave federal officials key data in Boeing 737 Max investigation says: The Federal Aviation Administration, or FAA, grounded Boeing's 737 Max ...
-1
votes
1answer
54 views

What is the Armstrong or vapor pressure limit of liquid metals in space?

Let's say a tungsten meteor in orbit melted would it stay in a ball minus the Roche limit of the Sun distrupting the ball? Would liquid metal be stable in space unlike most other liquids like water? ...
8
votes
1answer
185 views

Fastest orbit transfer constrained by maximum g-force magnitude

Let's consider an imaginary constant 1g rocket from Earth to Mars. What is the fastest possible trajectory? Intuitively it seems that the fastest travel time is achieved with the "radial" trajectory (...
3
votes
0answers
52 views

Surmountability of the technical risks to launching EM-1 on commercial rockets?

NASA administrator Bridenstine announced that commercial rockets (e.g., Delta Heavy and Falcon Heavy) would be considered as ways to launch EM-1 by July, 2020. Such a move would reportedly require a ...
3
votes
0answers
51 views

What was the fate of the Shiloh Launch Complex at Canaveral

Living near Canaveral, since 2013 (that I know of) much has gone back and forth about the proposed Shiloh Launch Complex in the former citrus groves within the north side of the Cape Canaveral ...
1
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0answers
16 views

Can an electromagnetic shield protect spacecraft from incoming radiation? [duplicate]

If we used an electromagnetic shield to protect astronauts from radiation, what could we use to power it and could it be possible?
4
votes
0answers
101 views

Can Delta Heavy launch a fully fueled upper stage with no payload attached?

There is right now talk of a potential dual launch mission to fulfill EM-1, where a Delta Heavy would launch a fully fueled upper stage to LEO, to there bet met with the Orion spacecraft, likely ...
4
votes
1answer
60 views

Did the Apollo missions use the Earth's magnetotail to lessen cosmic radiation?

I see a lot of images like this for the Apollo mission: 99% of them exclude the sun, and the ones that don't I can't be sure if they're accurate and cannot find sources. During the Apollo missions ...
3
votes
0answers
50 views

Why does Orion's Jettison Motor, have four nozzles but eight Attitude Control Motors arranged in an octagon?

Spaceflight 101's Orion Spacecraft Overview shows the following tests for the escape system. Why are there eight ACS thrusters arranged octagonally? Is it just to reduce cosine losses or does this ...
33
votes
1answer
4k views

Could the Saturn V actually have launched astronauts around Venus?

One of the more interesting proposed uses of a Saturn V was to launch a manned flyby of Venus. Some of the cargo would have been stored inside the tank of the upper stage, which would be retained ...
0
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0answers
68 views
+100

What was the smallest intentional, acknowledged slingshot maneuver?

I'll keep it short but please read through! Gravitation's $1/r$ potential means everything in the solar system is pulling on everything all the time. Gravitational slingshot maneuvers are normally ...
10
votes
1answer
2k views

What is under these four white covers on the upper part of the Orion capsule?

The New York Times article A NASA Journey to the Moon May Need to Find Another Rocket or Two shows an image of the Orion capsule in a file photo, along with the NASA director. There are four white ...
4
votes
1answer
72 views

How is atmospheric temperature measured from a satellite?

How does an Earth observing satellite measure the temperature of the atmosphere? Can they measure temperature at multiple altitudes, or measure the temperature of clouds?
0
votes
1answer
77 views

What are ways to store hydrogen for electric propulsion without a heavy pressure vessel?

This comment points out that any advantages of using low-mass ionized atomic hydrogen (i.e. protons) for electric propulsion if you had a fixed acceleration voltage and plenty of electrical power ...
3
votes
1answer
165 views

Efficiency of a nuclear thermal rocket

I am trying to calculate the specific impulse and thrust of a nuclear thermal engine, given the thermal power of the reactor, the maximum working temperature and the propellant. I'm calculating the ...
2
votes
0answers
29 views

Code to calculate distance between two satellites using their TLE data? [duplicate]

I am not acquainted with astronomy at all. I am developing an computer application which works on TLE data from space-track.org, and calculates things based on them. I need to find distance between ...
2
votes
2answers
109 views

Orbit, circularizing, apogee/perigee

First - my question: After the orbit insertion, in the coast stage, and assuming perigee is out of the atmosphere, and neglecting any external forces and influences - is the orbit now "fixed"? As in, ...
5
votes
2answers
83 views

How does the pattern on the MarCo cubesat's antenna boost data-transmission?

I was looking at a few posts that uhoh had made about the MarCo cubesat. One of the pictures was the one that I've posted below: The most I can gather from casual NASA articles is along the lines of: ...
4
votes
1answer
87 views

When will Parker Solar Probe begin “doing science”— is it already?

Parker solar probe is going to be doing 7 fly-bys of Venus before it reaches its lowest point in its orbit around the sun. Will it be doing anything before it reaches the lowest point? We're still ...
1
vote
0answers
51 views

Reducing the aerodynamic drag of multi-engined rockets: aft wake area

Have there ever been thoughts of reducing the aerodynamic drag that results from the empty space between rocket engines? More precisely, this extremely low-pressure area sucks up ambient air and ...
11
votes
1answer
1k views

What exactly is the purpose of connection links strapped between the rocket and the launch pad

I am curious on what are those multiple connection cables latched between the rocket and launch pad. What exactly is the purpose of it, I am aware that one should be for filling up the fuel. But ...
2
votes
3answers
195 views

How fast can an orbit exist in the solar system?

How fast is too fast to stay in orbit around any particular large body in the solar system?
1
vote
0answers
32 views

Analyzing Amateur Rocket Stability and Range Safety

I am working with a university bunch of other university students on building a very large amateur rocket. Our objective with this rocket is just to go very high, with no significant payload or ...
5
votes
2answers
1k views

Could a cubesat propel itself to Mars?

I wrote the answer below to the question Could a cubesat be propelled to the moon? before realizing that it said Moon and I'd written it for Mars, so I've cloned that question and moved the answer ...
7
votes
3answers
1k views

Could a cubesat be self propelled to the moon from LEO?

Is it possible with current technologies to propel a cubesat, which is launched from Earth, to the moon? If current propulsion systems are able to do so, how do I continue the research in this topic ...
2
votes
1answer
97 views

Does JAXA have any super heavy lift rockets?

Recently, JAXA and Toyota announced that they are developing a self driving rover for the late 2020s, do they have the ability now to launch anything that heavy, or are new rockets and launch centers ...
2
votes
1answer
95 views

How cold was it in the shade of the Parker solar probe?

What was the temperature in the shade of the Parker solar probe? Do to the proximity at the closest point the probe got to the Sun how much shade can be produced at that range?
3
votes
0answers
65 views

Are there any scientific or technical reasons for defunding WFIRST?

This week, the White House announced its proposed budget for fiscal year 2020, which of course includes NASA's budget for the same time period. Notably, for the second year in a row, it proposes ...

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