All Questions

9,541 questions
56 views

Has there ever been musical events or performances associated with deep-space spacecraft or their flyby maneuvers?

We've had several questions related to music being played (live, or recorded) in space: Music played in space (6 answers) How did Sergei Krikalev get (or build) the drum he is shown playing here? (no ...
3k views

How did NASA get the video camera on the Moon to track the LM ascent stage, considering the substantial delay?

The Moon's distance can be as much as about 406,000 km from Earth. That's a round trip light time of roughly 2 x 406,000 / 300,000 = 2.7 seconds or more, depending on how the signal was relayed to ...
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How does SpaceX's Dragon get to the ISS?

How does SpaceX's Dragon capsule get to the ISS? Does Dragon use the onboard Draco thrusters in order to raise its orbit to the station or does the second stage of the Falcon 9 perform the majority of ...
1k views

Exit film of moon landing departure

On Apollo 15, 16, and 17 NASA filmed the Lunar Module taking off and leaving the moon. With no-one on the moon how could the the camera move to follow it and who brought the exposed film back to ...
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L2 point in multi-moon system

For an SF novel, if there were two large moons orbiting a planet, let's say one moon the size of Earth's moon and the 2nd moon about 20% larger, and the planet roughly the size of the Earth, would the ...
430 views

How much does the rotation of the Earth affect re-entry and could we go against it?

I was thinking about how many things are affected by the Earth's rotation, and was wondering how much more difficult a retrograde re-entry would be (where the Earth's rotation direction is assumed ...
185 views

How to calculate New Horizons' MVIC camera max resolution at Pluto and Ultima Thule?

I am in trouble calculating the ground resolution of MVIC instrument onboard New Horizons; I found several documents about MVIC specs, like this one: http://www.boulder.swri.edu/pkb/ssr/ssr-payload-...
164 views

What's the closest that an Apollo mission passed GEO on it's way to the moon?

@Uwe's comment No astronaut ever visited geostationary orbit at 22-23k miles to maintain or deploy satellites. The Apollo astronauts just rushed by on their way to the Moon and back. below the ...
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What was the view from the Apollo spacecraft while travelling to the moon?

From what I read on the internet, I took around 3 days for Apollo 11 to get to the Moon. I'm curious what was the view from the windows of the spacecraft during the journey. What did the astronauts ...
60 views

What is typical lifetime of GTO rocket stages before reentry?

Most of geostationary satellites are launched at geostationary transfer orbit (GTO) first by rocket's upper stage. Than satellites separate and circularize the orbit by own propulsion. The upper ...
193 views

Puzzler: Precisely what maximum distance from the Earth did the Apollo 13 astronauts achieve?

tl;dr: Both this answer and this answer quote Wikipedia to state that the Apollo 13 astronauts reached 404,171 km from Earth. I'm not able to reproduce that value. According to JPL's Horizons the ...
174 views

How does the impulse-to-weight ratio of a propulsion system indicate an effective design?

While going through Sutton's propulsion elements text, I came across an example where he compares the values of impulse-to-weight ratio to that of specific impulse and deems it a "fair design". The ...
155 views

Liquid shield for spacecraft? [closed]

Initially this question was going to be on how to improve the Parker Solar Probe shield. While time passed I saw other possibilities for using this method for active shielding. Could a shield heated ...
90 views

Displaying NMEA data in text console [closed]

I'm using an ublox EVK M8T and I'm trying to make a script that displays in text console in real time the data from NMEA and also the time marker from when an event happens. Is there a possibility to ...
218 views

Parker Solar probe jumping through fire?

Is the principle of passing close the Sun with the Parker Solar probe the same as if you pass your hand over a candle flame fast enough you won't get burned?
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What is the most aerodynamic Satellite?

From what I understand at least in the lower orbits you want the least amount of drag possible. My brain is telling me that a long pole or submarine shape satellite orientated to the direction of ...
51 views

Is the ISS in danger of the outer radiation belt?

Is the ISS in danger of the outer radiation belt? I know that the ISS is in the low earth orbit and that it briefly passes through the base of the outer RB, but it is actually in danger? How does the ...
63 views

Does launching to interplanetary space from LEO require the least delta-v?

Based on this chart from wikipedia, (I do not know if I am reading it correctly) This all assumes LEO-Eq LEO to C3/0=3.22 LEO to GEO to C3/0=3.9+1.3=5.2 LEO to EML-1 to C3/0=3.77+0.14=3.91 LEO to ...
51 views

ISS reboost cost

The most updated data available at spaceflight.nasa.gov show that on day 361 there was a reboost: IMPULSIVE TIG (GMT) M50 DVx(FPS) LVLH DVx(FPS) DVmag(FPS) IMPULSIVE TIG (MET) M50 DVy(...
3k views

How far have astronauts been in space?

I just listened to a podcast where it was said that astronauts have only been at most 400 miles from Earth (except for the moon of course in the '60s/'70s). Is this true? I know that the ISS orbits ...
69 views

Could a network of probes be sent ahead of a mother ship to form a grid to lay a path for travel inside the solar system? After what certain speed anything larger then a stationary pebble could be ...
97 views

Where is the San Marco Launch Platform now?

@Hobbes's answer to a question about gregarious rockets mentions the San Marco platform of the Broglio_Space_Center. That Wikipedia lists the following coordinates: 2°56′18″S 40°12′45″E and that link ...
83 views

Could I claim a asteroid if I landed on it?

Could I claim a Asteroid if I landed on it? If so, could I have a nuclear reactor on it for a power generator?
65 views

The changes of a throttled Merlin-1d engine

With Merlin-1d being able to throttle down from its full thrust potential, this post about its throttle capability does not mention much of its change in performance. On the Wikipedia page of Merlin-...
52 views

Quantitatively, how deep are the stable equilibrium points in GEO? How much delta-v to move from one to the other?

This answer discusses a spacecraft in GEO using a two-impulse (circular → elliptical → circular) raise & lower maneuver to move (phase) itself by 180 degrees in longitude then return to synchrony. ...
136 views

Calculating a de-orbit burn, is this problem written correctly?

I'm having trouble finding the velocity and acceleration and therefore the time in seconds it takes, and I find the way the problem is written confusing, especially Determination of $\Delta V$: ...
445 views

Delta-v to move from GEO to GEO

To move a satellite in geostationary orbit, 166°55′E, to the antipode, 13° 4' 3.2" W, what delta-V would be needed for this to be accomplished? As for time constraints, I do not know what are the ...
104 views

Could nanobots travel through space?

I couldn't find a better place to ask this, but I figured this exchange would know about the problems associated with traveling through space. My question is if nanobots could spread through the ...
18 views

Algorithmic methods or techniques to find conjunctions in high N state vector ensembles?

Suppose I wanted to answer the question Will Starman/Roadster pass particularly close to any asteroids in the next few years? or try to predict satellite conjunctions around Earth (e.g. Celestrak's ...
369 views

Why has SpaceX changed Starship from carbon fiber composite to stainless steel?

Recently, there was news that SpaceX changed the material used for the BFS/Starship (upper stage of the BFR) from initially planned carbon fiber to metal which seems quite counter-intuitive as carbon ...
1k views

Could rockets launched from the ground use wings in the stages?

Could a slower or smaller rocket take advantage of lift if all the stages had wings? Could the stages reduce splashdown impact forces by using a spinning seedpod-like design (as shown in the image ...
3k views

Can I text on my cell phone from the ISS to Earth?

We know from Can we detect the cell phone, satellite phone, or walkie talkie of someone walking on Mars from Earth? that cell phone signals on Mars are potentially observable on Earth. I am not an ...
61 views

How Is The Quest Joint Airlock Operated?

I have searched and searched and cant seem to find any media whatsoever that explains or outlines exactly how the airlock is operated. What exactly is the process you go through to open it, do you ...
74 views

What's the largest screen for watching videos on the ISS?

There are many laptops on the ISS, for controlling non-critical things and for personal use during free time. Even at least one iPad. Are these the largest screens available? If the crew wants to ...
21 views

Trajectory information for Ranger, Luna, and other early Lunar explorers

Is there a location where I can get remotely reliable information on the trajectories for the old Ranger, Luna, and other lunar explorers? I'm especially interested in the ones that flew by the Moon ...
51 views

Bits per core for the different versions of the Apollo guidance computer core rope memory?

The first version of the Apollo guidance computer had a ROM of only 12 K words of 16 bit. Later it was doubled to 24 K and finaly tripled to 36 K words. The first version of core rope read only ...
1k views

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How often has the ISS's orbit been propulsive lowered intentionally?

The question Which engine worked the hardest to keep the ISS in orbit? laments the tireless efforts to keep the ISS from falling from the sky by regularly executing propulsive orbit-raising maneuvers. ...
110 views

Does the recently-tested Russian hypersonic craft enter space?

I am not going to invoke the K-word in this question! Hypersonic long-range craft have to fly pretty high to travel circa mach 20. Would they need to travel into space to do so efficiently?
73 views

Which engine worked the hardest to keep the ISS in orbit?

The ISS has spent two decades fighting drag caused by its large size and huge solar panels pushing through the tail-end of Earth's atmosphere only a few hundred kilometers above its surface. Question:...
145 views

Why didn't the Apollo 13 crew wear their spacesuits in the LM?

In the Apollo 13 movie, the crew take refuge in the Lunar Module, the temperature drops and they suffer the cold in their shirtsleeves. Is this accurate? Is there a reason they couldn't wear their ...
106 views

How long could a spacecraft be attached to ISS?

I've recently noticed how the "Design life, when docked to Space Station" parameter, varies across some of the modern spacecraft that are capable of docking to ISS these days: H-II Transfer Vehicle - ...