Many satellites are currently running on nuclear power. They use a different reactor design is all. Ion drives have a larger exhaust speed than chemical...

Hello, I'm going on holidays early April in Miami, and I plan to buy a telescope there so I need your help. I saw that these instruments are much cheaper in...

Ok, I'm probably the only person who doesn't know this, so don't grill me. Question is: Why do we only see one side of the moon?

ive just been bought a celestron powerseeker 114 telescope i would like to attach a camera to the telescope what is the best budget portable ...

i just had for christmas a celestron power seeker 114 telescope, is it possible you could answer some of my questions it comes with the following ...

I've have a Meade ETX 90 as well as a Nikon D70 with the adapter to connect the both. I've taken a few moon-shots and my results made me look this group up...

i love looking up 2 space and often wonder ! how did it all begin....? but not sure how 2 ask this questiion, if i believe in the big bang theory, i ...

There is a small program with demonstrates this theory at http://www.eskimo.com/~rebrady/Gravity.exe Bob

anyone remember the name of the double star that has one blue and one yellow component? I thought it was in the big dipper, but I can't seem to find...

Nick wrote: The mass-energy at the center is concentrated there. In whose frame of reference? Nothing approaching a black hole ever reaches even the event...

EL wrote: Dear John, If you were inside a moving elevator and had two tight-sealed jars, one full of chlorine-gas and one full of vacuum (almost empty...

wrote: That is because your rationale is heresy, and worse, according to their rules. This whole business is sorting whose rules are...

Greetings, I'd like to report this sighting, just happened a few minutes ago. I have 8:29 pm PDT on 9/21. I live in Ocean Beach, CA., about 32 north, 117...

Apology accepted, at least by me :-) Nice photo, BTW! Bob Doyle "Jim Moody" wrote in...

It looks like that modification is just to some settings of the camera head. The problem that is being fixed is that there is some processing that is going on...

This is an open invitation to participate in the Sun Shadow Investigation Project. This endeavor, SunShIP, is what typically is known as an Eratosthenes...

The September issue of Que tal is now online and available. There will be some great binocular worthy celestial events coming up this month starting with the...

The May 2004 Issue of the monthly online Earth/Space Science newsletter "Que tal in the Current Skies" is now available at this URL: ...

The December issue of Que tal is now online and available. This month read about the occultation of Spica by our Moon; viewing opportunities within the...

This month read about some of the highly viewable objects in the northern hemisphere winter evening skies. Coming up this month Venus will reappear in the...