Which operating system/systems are used in spacecrafts? Has FlightLinux been implemented yet; and if not how far in the testing are they? Any information on...

My questions concerns the gravity gradient on an orbiting tether, let's say 1,000 km long. The center of mass for the tether would determine its orbital...

I googled recently that hydrogen will dissolve in hydrocarbons such as decane when under pressure (and I can't find it again now!). It was unclear to what...

With Beagle 2 separation from Mars Express and entry, descent & landing at Isidis Planitia just 2 weeks away... I just have a couple of technical questions for...

The recent post regarding os say it is Flight Linux. Are the spacecraft systems computer programs written in C? Christopher +++++++++++++++++++++++++ "Kites...

I added the ability to simulate a charged particle moving in the Earth's magnetic field to my simulator. This lets you look at the motion of particles in the...

I got an account on SPENVIS at http://www.spenvis.oma.be/spenvis/ and have generated some radiation shielding data and graphs. You tell it what orbit apogee...

Hello: 1. When you make an international phone call - say from NY to China - how does the voice data travel ? Does it have to be send to the satellite and then...

I haven't seen anything posted on this -- has a flight readiness firing been scheduled for the Heavy before it launches? -- Reed

I understand that the large and expensive Gaia astrometry satellite will achieve very accurate stellar parallaxes from (I believe) the L2 point - which still...

As everyone knows, in four days it will be the 100th anniversary of the Wright brother's first powered human flight. Tomorrow, however, will be a somewhat...

This is the weekly Frequently Asked Question (FAQ) posting for sci.space.tech and sci.space.science . It is crossposted into sci.space.policy to explain...

The technology described in this post has not been tested, but it looks trivial when compared to rocket launchers, and it may reduce the cost of space access...

Two questions this time: 1) Is it possible to get kerosene-LOX or propane-LOX to 395Isp? I've seen numbers around 360 on www.astronautix.com . 2) How...

Would a supersonic jet the size of the spaceship-one gain much performance by being launched from underneath the white-knight from 48,000ft? Toby

Some methods I've seen mentioned for peroxide biprop ignition a Decompose the peroxide with catalyst pack. Pyrotechnic igniter in the chamber. Dissolve...

I am really amazed by all these optimistic people trying to do rlvs and i belive in these peoples cause! however it strikes me that these people all seem a bit...

(MattWriter) : Any spacecraft designed to return to Earth under control (as opposed to ballistic reentry) has to carry a substantial...

John Cramer's latest breakthru is adding an alcohol to 50% peroxide to make a cheap, easy to handle, easy to buy mono-propellant for his rockets. Does anyone...

I had thought I remembered that the first posts in the then-brand-new sci.space reorg groups went out in early January 1994, but reviewing Google records found...