Posts by julesstoop

by julesstoop
14.04.2013, 23:58
Forum: Celestia Users
Topic: 此帖已空
Replies: 1
Views: 2656

Re: ???????????????????

Bing clearly wins this round!
by julesstoop
20.12.2012, 23:13
Forum: Physics and Astronomy
Topic: 5 planets detected orbiting Tau Ceti
Replies: 14
Views: 6536

Re: 5 planets detected orbiting Tau Ceti

Hungry4info wrote:Why? There's a ~100 Earth-mass planet in our solar system with less surface gravity than Earth. Clearly the planet's mass can't be the only deciding factor in the surface gravity.

Since when does Saturn have a surface? :wink:
by julesstoop
28.04.2012, 11:15
Forum: Physics and Astronomy
Topic: Help: Angular velocity, and "rendez-vous" formula?
Replies: 1
Views: 1832

Re: Help: Angular velocity, and "rendez-vous" formula?

My gut feeling says is should look something like P = |Y| + Y/(X-Y) Where Y is positive when the satellite rotates in the same direction as the planet and negative when it's in a retrograde orbit. Let's say X = 24 and Y =1 then the result for P = 1 + 1/23 which is a little more than one hour, an exp...
by julesstoop
07.04.2012, 19:01
Forum: Celestia Users
Topic: MAC instead of PC
Replies: 14
Views: 4194

Re: MAC instead of PC

Please stop saying that people who prefer Mac OS to Windows (or Macs to other PC's) are fanboys. It makes me a little sad. The trade is actually very simple. Apple doesn't make 'cheap' products and that's something you pay for. In return you get a balanced out system which is a pleasure to use. The ...
by julesstoop
13.06.2011, 16:27
Forum: Physics and Astronomy
Topic: UFO on Mars?
Replies: 9
Views: 3850

Re: UFO on Mars?

They light grey colour could be caused by sublimated CO2 or water vapour. There's a lot of dry ice and water ice to be found on Mars, especially in the shadow side of craters near the poles. An example: http://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Sublimation_Of_Ice_In_Martian_Spring.jpg...
by julesstoop
22.09.2009, 21:34
Forum: Physics and Astronomy
Topic: Black Holes: Overweight Neutron Stars?
Replies: 12
Views: 5851

Re: Black Holes: Overweight Neutron Stars?

[b] And incidentally - none of this, obviously, happens with a Neutron star because a Neutron star does not have an event horizon - because it isn't a black hole. Just a few mental experiments: A bubble filled with air at Earth's atmospheric pressure (at sea level), but about as large as the size o...
by julesstoop
05.09.2009, 14:59
Forum: Physics and Astronomy
Topic: Black Holes: Overweight Neutron Stars?
Replies: 12
Views: 5851

Re: Black Holes: Overweight Neutron Stars?

A theoretical sufficiently large neutron star could have an event horizon (how such an object could form is a different question altogether). But that alone black hole it doesn't entirely make. Besides having an event horizon, a true black hole is supposed to be a singularity.
by julesstoop
31.08.2009, 23:52
Forum: Physics and Astronomy
Topic: Fake Moon rock
Replies: 11
Views: 3839

Re: Fake Moon rock

The rock was given to Willem Drees, a former Dutch leader, during a global tour by Neil Armstrong, Michael Collins and Edwin “Buzz” Aldrin following their moon mission 50 years ago. It's a setup :) Drees was a socialist. A good one, mind me, but in most American eyes probably socialist enough to be...
by julesstoop
16.08.2009, 02:27
Forum: Celestia Users
Topic: Animated earth mini project
Replies: 12
Views: 16064

Re: Animated earth mini project

You could set Celestia to run full screen and then tab to your applications... http://bob.pinkmirrors.com/celestia/cel1s.jpg Didn't know windows had this feature however... Except for the fact that it's gobbling up just about al of my CPU-cycles - which makes mu MacBook Pro sorta noisy and hot - th...
by julesstoop
03.07.2009, 19:53
Forum: Celestia Users
Topic: Help for Celestia on my laptop
Replies: 4
Views: 2693

Re: Help for Celestia on my laptop

rthorvald wrote:To rotate a selected object, ALT-click and drag across the mousepad. All the rest is conveniently listed in Celestia?s Help menu...

- rthorvald

And use two-finger scrolling (switch-on-able in the Trackpad prefs in System Preferences) to change the distance from the selected object.
by julesstoop
05.05.2009, 14:35
Forum: Development
Topic: Celestia in iPhone?
Replies: 2
Views: 2521

Re: Celestia in iPhone?

There is a Celestia-like 3D solar system simulation for the iPhone called 'GrandTour' and then there are several more traditional 2D stellarium like apps (planispheres). 'Star Walk' and 'Starmap' pop to mind.
by julesstoop
06.04.2009, 22:55
Forum: Physics and Astronomy
Topic: Betelguese
Replies: 10
Views: 4102

Re: Betelguese

Well, I don't 'require' it, but I wouldn't mind seeing it here.
by julesstoop
05.04.2009, 04:08
Forum: Celestia Users
Topic: You know you're addicted to Celestia when...
Replies: 14
Views: 5068

Re: You know you're addicted to Celestia when...

I often press 'enter' when I want to invoke a Google search, and I regularly mix up Celestia controls with Google Earth controls (pressing the wrong mouse butto to rotate a body's surface).
by julesstoop
05.03.2009, 19:34
Forum: Celestia Users
Topic: Installing Celestia on Mac unsuccessful
Replies: 2
Views: 1609

Re: Installing Celestia on Mac unsuccessful

Celestia has always been running and installing fine on all my macs so the problem is probably on your side. If you don't have admin rights, try installing it in the folder Users/yourhomefolder/Applications If you are an admin, and can't install in either Applications-folder, repairing your disk per...
by julesstoop
14.02.2009, 14:34
Forum: Physics and Astronomy
Topic: Would the moon look like this if it was real?
Replies: 12
Views: 4975

Re: Would the moon look like this if it was real?

For reference, some real shots: http://www.phillyskyline.com/misc/wallpaper_070829.jpg http://www.dcresource.com/reviews/panasonic/dmc_fx100-review/nightshot.jpg http://mavsurfer.smugmug.com/gallery/4833595_za2to#287662892_fxG7C-M-LB http://www.creativephotoimages.org/images/gallery/Richard%20Knisbe...
by julesstoop
12.02.2009, 22:22
Forum: Physics and Astronomy
Topic: Would the moon look like this if it was real?
Replies: 12
Views: 4975

Re: Would the moon look like this if it was real?

Talking from my own experience with photography: When I take a picture of a skyline like this, I generally need an exposure of about 0,5 to 10 seconds depending on circumstances, aperture and ISO. For taking a picture of the moon, while still being able to see any detail on the surface (using simila...
by julesstoop
12.02.2009, 18:34
Forum: Physics and Astronomy
Topic: Would the moon look like this if it was real?
Replies: 12
Views: 4975

Re: Would the moon look like this if it was real?

I underestimated the length of the lens obviously. With the focal lens you used the disk of the moon should fit about 13 times - side by side - horizontally. So the angular size of the moon seems about right. On the other two accounts: yes :) The moon should be fuller and brighter. Since it's so clo...
by julesstoop
11.02.2009, 22:52
Forum: Physics and Astronomy
Topic: Would the moon look like this if it was real?
Replies: 12
Views: 4975

Re: Would the moon look like this if it was real?

The phase of the moon suggests that the sun is about to rise, so the sky seems too dark for the moment of the day. The size of the moon also seems a bit unrealistic. I have a feeling you didn't take the picture with a (long) telephoto lens (a high magnification, so to say) so the moon should be smal...
by julesstoop
06.02.2009, 23:08
Forum: Celestia Users
Topic: White text on clear background almost disappears
Replies: 9
Views: 2318

Re: White text on clear background almost disappears

Reading this thread I'm suddenly thinking something along the lines of the pop-up names of applications in the OS X dock:

Image

Go to advanced search