Hi. I'm looking for advice. Our astronomy club has a homebuilt 18" f/6 dobsonian. I think it has a 30" square rocker box. This telescope cries for an...

I just don't get this. I should have left the secondary alone as it came from Orion. Damn it. I purchased a laser and an Orion collimation eyepiece, and when...

Hey all, I'm kinda curious as to what magazines we subscribe to. Here's my list: Sky & Telescope National Geographic (just started it for $20 a...

Hi, This is a question for seasoned observers regarding UFO's. NOT sci-fi alien encounters and all that junk, rather strange objects you have seen with no...

Evangelist Luke reports an eclipse of the sun, but is he correct? We slightly modified the biblical report for the benefit of the scientifically minded...

Still a difficult concept for me, I'm trying to understand the reason for spending the large amounts of money for a probe like this. A few weeks ago, I would...

On Fri, 18 Mar 2011 20:41:37 -0700 (PDT), Too_Many_Tools wrote: On Mar 18, 10:10*pm, Boris Kapusta ...

So the probe will only last for a couple days now, because it landed such that the crappy solar panels only get 90mins of sun per day, not enough to keep it...

Consider this: Humanity existed for over 200,000 years, hunting and gathering, before agriculture began. It became well-established on the order of 10,000...

NASA Science News for Jan. 11, 2012 NASA's Kepler spacecraft has discovered the tiniest solar system so far: a red dwarf star with three rocky planets...

Does anyone know of a good location in Maryland or Northern Virginia that is within a 2-hour drive or so? As far as I know, the State Parks close at sunset.

What exactly does it "mean" for an optic to be diffraction limited? Does it mean that the optic is capable of achieving the maximum resolution of its...

Doug Peterson wrote: I received one at work today, will not be able to do a star test till later. It will be interesting to see how "colorful" it is on...

Can anyone explain what's up with the price of Orion's APO? Is it $499? The S&T article shows it at $429. Did it go up? Was it improved? I want a good...

Hi, first, apologies if this is the wrong forum for this. I have been asked by a niece of mine if there is proof of the heliocentric model for the solar...

Planetary climates are defined by the degree of inclination within a spectrum between polar (90 degree inclination) on one side and equatorial (0 degrees...

http://techxplore.com/news/2015-09-ion-space-fuel-efficiency.html

Hi. We have just acquired a (2nd hand) short tube catadioptric equatorial reflector telescope, D=114mm F=1000mm. The maker, we assume, is G-Tech USA (written...

Radio Meteor Observation Bulletin No. 307 of February 2019 (38 K) is available now as http://www.rmob.org/rmobtext/rmob1902.txt More information and the...

I saw NGC 185 for the first time last night and have to tell you all about it. I have, as yet, no GOTO or DSC, so everything I find is by hunting. I had...