Once the X Prize is won, is a goal of achieving orbit reasonable? Could someone build a reusable ship that is capable taking three passengers to orbit in a...

Here is a puzzle. There is a theory of dark matter that says that dark matter is simply mirror matter. This is not antimatter but matter that is reflected...

WORLD'S SINGLE LARGEST TELESCOPE MIRROR MOVES TO THE LBT From Lori Stiles, UA News Services, 520-621-1877 November 3, 2003 Contact information: John M. Hill,...

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On Wed, 27 Aug 2003 22:04:12 -0700, Larry Gales wrote: In the past I have heard newsgroup posts about the Titan II...

In the past I have heard newsgroup posts about the Titan II first stage, that it had a gross mass of 269,000 lbs and an empty mass of 9000 lbs, which would...

How does the width of a frequency band relate to the actual digital communications bandwidth? For instance, the Ka band satellite downlink is from 18.3-18.8...

The header of the message pretty much says what my question is: Why is Xenon the propellant of choice for an ion thruster? What makes it a better choice than...

The shuttle-derived heavy-lift vehicles under discussion would for the most part be powered by the SSME. Why use the expensive SSME on an expendable vehicle...

Why were early US manned spacecraft pressurized with pure oxygen at 5 PSI when the partial pressure of oxygen at sea level is only about 3 PSI? I'd have...

I am not a particular fan of SSTO, but it appears to me that SSTO has long been within our grasp. The best figures that I could get for the Titan II 1st...

I am not a particular fan of SSTO, but it appears to me that SSTO has long been within our grasp. The best figures that I could get for the Titan II 1st...

I skimmed a story about the recent outside repair mission on ISS. It mentioned that the spacewalkers were always ahead of schedule, it took 1 1/2 hours to go...

Is gravity so strong that a meteor swinging by the earth, moon or planet at 25,000 miles per hour on a tangent trajectory is pulled in for a direct impact?...

Hello All: Who has the most powerfull rocket engine? In terms of Lifting capability? --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus...

I'll try asking this again. I cannot find the reasons why the two Lunokhod rovers "died". I assume it had to do with battery charging after the long lunar...

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

Hi everyone. I'm working on the propulsion system for a small student built satellite as part of the university nanosat competition and I was hoping you could...

Here's a thought - d'oh flag on We know that to achieve an orbit at 100 miles altitude, the little suborbital ships can't get up to that velocity. And...

How high an orbit is this above the Earth?