All Questions

5
votes
1answer
971 views

Why is Beresheet doing a only a one-way trip?

Why is the SpaceIL Lunar Lander doing a one-way trip? Is that a common project to do nowadays, to send landers to Mars and the Moon without returning them?
8
votes
1answer
142 views

What are the options of a space enthusiast regarding visiting Plesetsk?

Last year I was in Murmansk and fell in love with the far north of Russia. I'm planning another trip somewhere towards Karelia, northern Ural or such... and being a space enthusiast I'm quite tempted ...
1
vote
1answer
68 views

How do Inmarsat 5 F4's beams correspond to all of these antennas and feeds?

note: This is an old-style @uhoh question meaning that it is a bit on the long side. In this case I think it really needs to be since the question is a bit complex; I'm trying to understand how all ...
2
votes
1answer
81 views

What is the order of magnitude forces due to Earth's magnetic field, sunlight, drag, oblateness and tidal forces compare?

What in order of magnitude does pressures vary in LEO due to diamagnetic repulsion of Earth's magnetic field, sunlight, drag, oblateness and tidal forces compare on an ideal satellite? Is there any ...
1
vote
0answers
65 views

Do space stations have standardized officer designations for crew?

I have some anecdotal information. The ISS has a commander, and I noticed here that it had a Flight Engineer, and in this article (found here) I see that Skylab had a Science Pilot. Do space stations ...
1
vote
0answers
110 views

Speed needed for the ship to escape Mars, on The Martian movie

Based on the two speeds and altitudes that are presented in the movie: "The Martian" which are respectively 741 m / s and 1350m, 850 m / s and 1843 m I would like to prove with calculations whether or ...
2
votes
0answers
77 views

How to determine altitude when altimeters fail?

Specifically for high altitude amateur rocketry, how is altitude determined when you get too high(too low pressure) for barometric altimeters to work? I heard about GPS, however, COCOM limitations ...
4
votes
2answers
174 views

If we can reduce travel time to Mars below the Hohmann standard, would we still use the same launch window?

If we can reduce the travel time to Mars below the Hohmann transfer orbit's typical 258 days, would we still use the usual Hohmann launch window or delay launch accordingly? For example, if we ...
5
votes
2answers
961 views

NASA's RS-25 Engines shut down time

As a follow up to my other question about RS-25's ramp-up time, I was wondering what would be the ramp-down times for the RS-25, i.e. what would be the time that takes to go from 100% thrust to 0% ...
3
votes
2answers
91 views

Would communication with Houston still be possible in a LEO debris cascade?

In the film Gravity (2013), the astronauts on STS-157 & the ISS lose communications with mission control in Houston, supposedly due to the chain reaction of debris collisions taking out ...
1
vote
1answer
87 views

Difference between “undock” and “depart” (SpaceX Dragon Mission 1); when did it leave?

Reading the Astronomy SE question Did I see the dragon capsule on Friday night? I thought I'd check some times. Wikipedia's SpX-DM1 says: ...
2
votes
1answer
90 views

Space Shuttle Orbiter VRCS

I am looking for details on the Space Shuttle Orbiter Vernier Reaction Control System (VRCS), used for fine maneuvers on orbit, such as docking. Wikipedia has very little information on the system. ...
5
votes
0answers
74 views

Is Lunar Horizon Glow still a thing? Has the “dust settled” on the topic?

The title gets its inspiration from Is the Flyby Anomaly still a thing? but the topic is different. The Lunar Horizon Glow is a phenomenon observed by some of the Surveyor missions. While the Sun is ...
4
votes
1answer
89 views

What kind of “jet engine-like propulsion” does HyperSciences use to accelerate projectiles to sub-orbital altitudes?

The Teslarati article For HyperSciences, geothermal energy builds a path to space describes the use of technology which has been applied to drilling to launching projectiles to sub-orbital altitudes ...
12
votes
1answer
3k views

What is Earthy controling in the ISS cupola?

ScienceAlert.com's Astronauts on The Space Station Liked SpaceX's 'Earthy' Toy So Much They Kidnapped It shows a series of photos of Earthy, the new plushy member of the ISS crew. In the photo below ...
-5
votes
1answer
65 views

Why is there no exosphere demonstrating moon dust and particles in the Apollo footage?

I have read dust levitates on the moon's surface extending to 100 miles in the sky (horizon) creating an exosphere. Dust levitates because the surface of the moon and dust particles have become ...
5
votes
1answer
205 views

NASA's RS-25 Engines

I am developing a FSX-based space flight simulator FSX SpacePort. I've been trying to get the detailed specs on NASA's RS-25 engine, namely, what were the ramp-up times for this engine? As in, how ...
2
votes
0answers
45 views

What happened to International Microspace's $100 million contract?

This might be an obscure one. As I understand it: Diamandis co-founded Microsat Launch Systems, which was renamed International MicroSpace, in 1989. (This is apparently not the Micro-Space of 1977 to ...
2
votes
1answer
92 views

What is the lowest power signal that the DSN can detect?

It is said that the Deep Space Network can detect low-power signals sent from Voyager in the range of 10^-16 W. I can't seem to find any sources that indicate what the minimum power requirement of a ...
1
vote
0answers
56 views

What did Apollo 11's SSTV signal sound like?

The TV signal from Apollo 11 had limited bandwidth, and an oddball format was used to send and convert the signal. All of the modern SSTV demos I've seen on YouTube seem to take around a minute to ...
1
vote
0answers
30 views

Seeking news about Lunar Tunnel Boring Machine (TBM) [duplicate]

My last question was a bit to specific. Does anyone have any news about lunar tunnel boring machines? Reference to last question Can anyone find a more recent NASA paid for study on lunar tunnel-...
1
vote
0answers
48 views

Self Learning, textbooks [closed]

I was thinking of getting the Pearson textbooks for Algebra, Trigonometry, and Calculus. I need to review Algebra and Trigonometry. Calculus I will be self teaching. Does anyone have another ...
5
votes
2answers
144 views

Issue with units for a rocket nozzle throat area problem

I'm working through How to Design, Build, and Test Small Liquid-Fuel Rocket Engines. The guide explains calculating a rocket nozzle throat area using Eq. (7): $$A_t = \frac{w_t}{P_t} \sqrt{\frac{R ...
3
votes
0answers
42 views

How to measure the temperature inside a combustion chamber

This question is inspired by How do you determine what the temperature will be in the combustion chamber of a rocket engine? . I wonder how you would mesaure the temperature on the inner surface of ...
6
votes
2answers
576 views

What is the orbit and expected lifetime of Crew Dragon trunk?

Per the timeline mentioned in the webcast the Crew Dragon separated from its trunk before the deorbit burn. I suppose that happens so clean separation can be confirmed before committing to deorbit as ...
0
votes
1answer
191 views

ISS location identification; estimate size and direction of astronaut acceleration puzzler

note: This question addresses the same video and phenomenon described in this answer (which I found after posting this) but here I'm asking for an analysis of the trajectories of the test masses (the ...
10
votes
3answers
342 views

Nose cone of Dragon 2 closes only after deorbit burn

The Dragon v2 capsule opens its nose cone right after it separated from the Falcon's second stage. It is then open for the whole flight until after the deorbit burn. So there appears to be a good ...
11
votes
1answer
796 views

What is the orbital boost acceleration of the ISS?

How much acceleration does the International Space Station experience during its orbital adjustment boosts? How much thrust and for how long? Bonus question: what is the highest acceleration that the ...
1
vote
1answer
100 views

Do GPS satellites use the earth's magnetic field in any way?

There's a lot of speculation about how changes or flips in the Earth's magnetic field would affect us, our machines, and sea turtles. I'm curious about the GPS satellites themselves. In one way they ...
17
votes
3answers
3k views

Why does this boat have a landing pad? (SpaceX's GO Searcher) Any plans for propulsive capsule landings?

The BBC News article SpaceX Dragon demo capsule set to return to Earth talks about the return of the first Crew Dragon capsule to Earth: Four parachutes should bring it into soft contact with water ...
6
votes
1answer
733 views

How did the Luna spacecraft collect samples of the moon and containerize them for return to Earth?

The Wikipedia page Sample-return mission and this answer list Luna 16, 20 and 24 missions as each bringing back of the order of 100 grams of lunar material to Earth, but their Wikipedia pages don't ...
2
votes
1answer
89 views

How do you determine what the temperature will be in the combustion chamber of a rocket engine?

I am guessing it is dependent on the fuel and oxidiser and the chamber pressure but is there an equation that would calculate the chamber temperature?
1
vote
0answers
47 views

Can anyone find a more recent NASA paid for study on lunar tunnel-boring machine?

The one that I found is from May 5,1988 by Professor Stan Lowy Department of Aerospace Engineering Texas A M University https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19890008382.pdf https:/...
3
votes
2answers
126 views

Launch profile autopilot

I'm new here, and I am delighted this forum exists! I'm working on a spaceflight simulator (FSX SpacePort) and currently, developing automated guidance module (I guess, a space autopilot). The ...
6
votes
2answers
174 views

Is there a practical maximum size for a space capsule returning to Earth?

Assuming I need to get a large cargo or a lot of people safely to Earth's surface in one go in a single-use capsule of the Apollo CM / Soyuz descent type but larger, and assuming that the capsule is ...
7
votes
0answers
55 views

Does the kinetic impact of gas particles cause erosion to the surface of objects in orbit?

When satellites or space stations orbit the Earth, they are constantly experiencing a low level of aerodynamic drag from Earth's atmosphere. The ISS needs to be reboosted every few months to account ...
1
vote
1answer
133 views

Could a pressure suit be used for a short emergency EVA?

What if a docking accident leaves the spacecraft depressurized and unable to re-pressurize. The hatch may be jammed/ punctured or a window blown. In such a scenario, the astronauts would have their ...
3
votes
0answers
75 views

Are the Tintin's talking to each other? If so, how? (SpaceX' Starlink tests)

Tintin A and B are the first two exploratory and testing spacecraft for SpaceX's Starlink program. It looks like they are in very similar orbits in both space and time, and are probably that way so ...
3
votes
1answer
107 views

What's the shortest time to reflight of a Falcon 9 booster?

What has been the shortest time in between the landing of a Falcon 9 booster, and SpaceX reusing them on a different mission?
1
vote
1answer
37 views

Why can Cryosat's dual antenna “better discern steep slopes” of Antarctic ice than Sentinel-3?

The BBC's Climate change: Satellite fix safeguards Antarctic data explains that earlier problems of missing data near the coasts have been addressed, and though scientists are hopeful, there is ...
1
vote
1answer
36 views

How to extract coordinates of an LROC Image?

How can I extract the coordinates from an existing LROC image to search for that area in the LRO Image Search Tool? What coordinates should I enter in this example? http://wms.lroc.asu.edu/lroc/...
1
vote
1answer
165 views

What is the purpose of the spacesuit in the crew dragon?

In this picture, in the background, there is a spacex spacesuit. I could not find why they had it. Are they going to use it for a spacewalk? Are they going to test it in microgravity? So my question ...
3
votes
1answer
100 views

Launch pads flame deflectors

I was interested in knowing if all launch pads possess a flame deflector. I'm inclined to say yes, as the structure seems vital for a safe launch. Wanted to make sure, though, if there could be a case ...
2
votes
1answer
87 views

Where is the debris in the Hayabusa 2 touchdown video coming from?

In the video of the touchdown of Hayabusa 2 (https://www.engadget.com/2019/03/06/hayabusa2-probe-ryugu-touchdown-video/) no debris is visible until touchdown. After that, there is a lot of it (though ...
2
votes
2answers
206 views

How do satellites remain safe from space debris and meteorites?

Since space is not that clean, always there is a chance to hit by an asteroid / meteor. So how can satellites remain safe orbiting Earth?
4
votes
2answers
149 views

Realistic cost and feasibility of sun-shading?

I got in a discussion about possible solutions for climate change and this Wiki-article on sun-shading was proposed as a alternate solution with some ideas I'd not heard of. The cloud of small ...
8
votes
1answer
161 views

How far will the debris cloud from Hayabusa-2's touch-and-go sample recovery travel around Ryugu? Will any have escaped to heliocentric orbit?

HAYABUSA2 MOMENT OF TOUCHDOWN This animation, extracted from a longer video, shows the moment of Hayabusa2's 21 February 2019 touchdown on asteroid Ryugu. JAXA Source: Planetary Society's Watch ...
2
votes
1answer
116 views

Any earth-based film or color still photography of Apollo CM re-entries?

After watching the IMAX Apollo 11 film today I wondered if there was any film footage from outside of an Apollo Command Module (CM) re-entry (or even color stills). It does not have to be from 11. ...
2
votes
0answers
40 views

CSpOC’s identical TLEs

Identical TLEs are often published by CSpOC at https://www.space-track.org/. For example, here’s the first line of the three newest TLEs for IRNSS-1H: ...
3
votes
1answer
163 views

What Apollo equipment could be salvaged from the Moon?

If humans returned to the original Apollo landing sites, what previously left-behind equipment could reasonably be salvaged as part of a future mission or colony? That is, is everything that was left ...

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