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Celestia is a free real-time space simulation that lets you experience our universe in three dimensions. Unlike most planetarium software, Celestia doesn't confine you to the surface of the Earth. You can travel throughout the solar system, to any of over 100,000 stars, or even beyond the galaxy. All travel in Celestia is seamless; the exponential zoom feature lets you explore space across a huge range of scales, from galaxy clusters down to spacecraft only a few meters across. A 'point-and-goto' interface makes it simple to navigate through the universe to the object you want to visit.

What's New

Version 1.6.1:
  • contains bugs fixes
  • new and more complete translations
  • updated data files (including new exoplanet discoveries)

Requirements

Mac OS X 10.2 or later

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Celestia User Discussion

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Alexrom1000 Member IconReview+189
Alexrom1000
+9

The idea is interesting. Implementation was nice as well. What the program lacks is a good, solid update. On July 9th, 2009 we saw the last news from Celestia team. I hope the project is not dead...

Reply0 replies
Version 1.6.0
Masongill Member IconComment+0
Masongill
+0

Selecting "Move Closer" makes any image window go blank. ?? (MacBook Pro, OS 10.6) Not quite as much fun as Google Earth.

Reply0 replies
Version 1.6.0
Michael-A. Member IconReview+15
Michael-A.
+0

For any people who have ever found that jumping around to different places in Google Earth was an addictive adventure, this is even better...

Reply0 replies
Version 1.5
Enrico-Nencini Member IconReview+23
Enrico-Nencini
+0

Awesome software. AND free. Tested on PPC and Intel (leopard): works seamlessly.

Reply0 replies
Version 1.5
JazzJohannes Member IconReview+0
JazzJohannes
+0

Brilliant, I love the complete StarTrek TNG add-on.

Reply0 replies
Version 1.5
Tice Member IconReview+119
Tice
+0

This app is great. I used it since the early days and it still gets me. Wonderful work. Only the navigation could be more intuitive (i.e. the arrows left and right could change the direction instead of turning and up and down shouldn't be opposite).

Anyway, thanks for this great piece of freeware! : )

Reply0 replies
Version 1.5
versanick Member IconReview+0
versanick
+1

First, let me reccomend this to anyone with an interest in Astronomy, or who is taking in Astronomy-related class somewhere (I sure wish I had this years ago when I was taking Astronomy in college).

Now, an amazing 3-dimensional adventure through the solar system and much more. To this minute, I've been through mostly the entire Milky Way, and I don't even know how far this program maps. This is amazing.

Very easy to learn how to navigate around. Drag around with the mouse, or use your arrow keys, travel at 100 m/sec or 100 times the speed of light, or on the scale of astronomical units per second (1 AU is the distance from earth to sun)... impressive, easy to turn on/off labels of orbits, planets, constellations, and much more (all easy to find in Preferences). You can even see cities, mountains, and other things, all at the click of the mouse.

Great choices of rendering paths (for graphics) from Basic to OpenGL 2.0, and many things in between (which will work better with different video cards, old and new). It will even tell you (in most cases) if you cannot use the selected rendering option. There's something for anyone. Beautiful graphics. I suggest that you see for yourself. It's hard to describe the fact that I can see almost every detail of the moon, as deeply as I've ever studied its surface. Very, very impressive on my 19" monitor on my G5 tower.

There's even a 'Favorites' menu (akin to Bookmarks). Zoom from planet to start to constellation in seconds. There is so much you can do with this program. Or just leisurely show your friends what a cool program you found.

I highly suggest this for anyone _teaching_ astronomy as a professor or teacher. Chris Laurel, and anyone else involved in developing this deserves credit for the most impressive and comprehensive (yet simple in nature) space exploration app I've seen that is so easy to use, even a relative computer novice can tool around.

And free. Props. I honestly can't say anything negative. Congrats on an amazing app. I wish I found this a long time ago.

Reply0 replies
Version 1.4.1
Self-Inflicted Member IconComment+0
Self-Inflicted
+1

Wow. Seriously... wow.

Space is big. No, bigger than you're thinking. Really, really, mind-bogglingly big. Wow.

Easy to get lost in, too -- in time as well as space. I've lost track of how many hours I've spent tonight cruising the cosmos.

This is really an amazing visualization tool. It's not as if I need it in my daily work, but I sure like having it to escape to.

Reply0 replies
Version 1.4.1
AppleCrypt Mods Member IconComment+21
AppleCrypt Mods
+0

incredible - i love this s/w!!!
thank you :)

Reply0 replies
Version 1.4.1
Anonymous Member IconReview
Anonymous
+0

At least one fan hopes for an update with:

-toggle on/off full screen
-the tenth planet!
-solar system guide (wide view of orbits)
-satellite mission guides with links to nasa pics

Thank you for a brilliant program, Celestia is the bomb.

Reply0 replies
Version 1.3.2
user icon+2
Sos-Ufo
Version 1.6.1
> 5 20

Ratings

Overall
(20)
Current Version (1.x)
(20)

Details

Downloads 57,205
Version Downloads 20,581
License Free
Date 10 Jun 2011
Platform OS X / PPC 32 / Intel 32
Price Free