Community Digest

Top new questions this week:

Optimal depth for underground flyby?

Planetary flybys are used to modify the orbital parameters of spacecraft. For maximum gain, a large deflection angle is often desired. But the deflection angle is limited by the closest approach, ...

orbital-mechanics flyby patched-conic  
user avatar asked by SE - stop firing the good guys Score of 17
user avatar answered by Litho Score of 8

What happened to Mariner 2 after it flew by Venus?

I found myself wondering about what ever had happened to the Mariner 2 spacecraft (the first successful flyby of any planet) after it flew by planet Venus. According to it "...

venus flyby mariner-2  
user avatar asked by Deko Revinio Score of 12
user avatar answered by SE - stop firing the good guys Score of 22

Can a meteor shower have a interval greater than 1 year?

Most meteor showers are yearly events. In the manga "SoSo no Frieren" the characters experience a meteor shower that happens only once every fifty years. The story does not take place on ...

orbital-mechanics exoplanet comet meteoroid meteors  
user avatar asked by Mindwin Score of 12
user avatar answered by notovny Score of 20

Will SLS be launched as often as the space shuttle was?

Again, I did some research, and again, the results aren't that impressive. I was able to find that SLS is to become the " successor to the retired Space Shuttle, and the primary launch vehicle of ...

crewed-spaceflight space-shuttle sls uncrewed-spaceflight  
user avatar asked by Deko Revinio Score of 10
user avatar answered by Organic Marble Score of 18

Why does JWST make images of planets from solar system?

NASA has already made images of planets from the solar system before. So why is NASA/ESA making images of planets from the solar system by using the JWST instead of exploring unseen parts of universe?...

nasa james-webb-telescope esa  
user avatar asked by M. Pedro Score of 6
user avatar answered by Ruben Score of 17

Nitrogen trifluoride as a high density oxidiser

Nitrogen trifluoride (NF3) is a liquid between 66K and 144K and has an incredible density of 1.885 g/cm2. It has a pretty great specific impulse, although combustion temp is a bit high, and AFAIK is ...

fuel performance  
user avatar asked by R. Hall Score of 6
user avatar answered by GremlinWranger Score of 17

Artemis H2 leak -- what is rationale behinfd 4% stated go/no-go parameter

The Artemis H2 leak has been quoted in %. I believe 4% is the stated limit. I assume that measurement is vol % of H2 in air but I haven't seen any real definition of the parameter. What is the ...

hydrogen artemis  
user avatar asked by tckosvic Score of 4

Greatest hits from previous weeks:

Why destroy Juno at the end of the mission?

As follows from the mission timeline: Launch - August 5, 2011 Deep Space Maneuvers - August/September 2012 Earth flyby gravity assist - October 2013 Jupiter arrival - July 2016 Spacecraft will orbit ...

juno end-of-life orbital-lifetime  
user avatar asked by Creative Magic Score of 89
user avatar answered by Mark Adler Score of 131

Could a spacecraft theoretically fly a smooth, curved arc of a turn in space like an aircraft?

I understand there in no air is space which is what allows an aircraft to fly a curved flight path. This is strictly a theoretical question given today's technology. Here are the conditions: There ...

orbital-mechanics spacecraft physics  
user avatar asked by Steve Score of 7
user avatar answered by Organic Marble Score of 22

Who was the first human to sleep - perchance to dream - on the Moon?

Incidentally I don't mean "on the lunar surface, asleep laying on the surface of the moon" :) So (A) who (if anyone) was the first human to actually be asleep (that is to say, presumably inside the ...

the-moon astronauts spaceflight-firsts sleep  
user avatar asked by Fattie Score of 97
user avatar answered by Russell Borogove Score of 177

How fast will 1g get you there?

If you have the energy for a constant 1G thrust, how long would it take to get to the planets in our solar system? How long for the 5 nearest solar systems? Assuming turn over and decelerate at ...

user avatar asked by James Jenkins Score of 62
user avatar answered by HopDavid Score of 52

Shouldn't space junk fall back to Earth on its own? How long will take for a ~1 cm piece of junk in LEO to fall back to Earth on its own for example?

I'm a noob in this subject and know little about space exploration, but I wonder about this every time I read the news: Wouldn't drag make all space junk fall back to Earth after some time? I'm ...

orbit low-earth-orbit debris earth drag  
user avatar asked by Joe DiNottra Score of 51
user avatar answered by PearsonArtPhoto Score of 78

Can magnets be used to launch spacecraft?

I assume there is some reason we don't use magnets to launch off Earth. Are they not strong enough? Isn't magnetic force technically stronger than gravity?? Would either of these work: A tube tunnel ...

launch spacecraft-development spacecraft magnetic-field magnetorquer  
user avatar asked by Space Librarian Score of 17
user avatar answered by TildalWave Score of 23

What are some of the obsolete technologies that space agencies used in day-to-day work during the 1960s?

This may be a vague question, please let me know if more info is needed. As we know, NASA put a man on the moon using technologies that we no longer use, like slide rules and entire teams of people ...

history technology  
user avatar asked by HFOrangefish Score of 20
user avatar answered by David Hammen Score of 40

Can you answer these questions?

How can I determine a rotation matrix from unit vectors?

I want to determine the rotation matrix from which compute the Euler Angles to rotate my spacecraft in order to point in a specific direction. For example, i want the z body axis of the spacecraft to ...

attitude mathematics rotation-sequences  
user avatar asked by Frank Score of 1

Where to find detailed information about space mission like Voyager or Galileo

Is there any place aside from NASA-JPL web page, where there is only some general information about the missions, where one can find more in-depth detailed values? For instance, I am looking for the ...

gravity-assist reference-request scientific-data  
user avatar asked by ikerdc Score of 2

Mathematical description of the flight trajectory parameters of voyager 1

I would like to run in some simulation software an end-to-end simulation replicating the flight of voyager 1. I am somewhat conversant with GMAT that I think would have this capability or perhaps ...

voyager gmat  
user avatar asked by tckosvic Score of 2
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