About the multiple light sources: I think that a code in ssc could permit a planet to be illuminated by multiple stars. The code could have the number or the name of the star to illuminate a body.
About the greenhouse effect: I think it is necessary to put a code determining the temperature of the planet based on a greenhouse effect code value. This code could be similar to the albedo: 0 for no greenhouse effect and 1 to the maximum greenhouse effect temperature on a planet.
The value 0.07 is for a planet with small atmosphere like mars, 0.15 for an atmosphere similar to the Earth, 0.2 to 0.3 for a big and thick amosphere, 0.4 to 0.5 for a between rocky and gaseous planet, 0.6 to 0.7 for gas giants and 0.8 to 1 to brown dwarfs.
About correcting the X spectral stars: Delete the formula of X spectal stars and put a new one that permits black holes appear. And put the black hole models or a texture for it can appear. I think it would be very cool if I could create a system of planets orbiting a black hole behaving like if it would be a REAL star.
About adding two spectral types of stars: Because green and violet stars also exists and it would be
***VERY COOL*** adding these two new stellar classes: E and H type stars. The E type is for green stars and H for violet stars. I could create a system orbiting a E3V or H2V star. This also would be very cool. But the problem is that I don't know if these stars are hotter or colder than the Sun.
About support to put stars in the same distance of other galaxies and support to put much more distant planets to their stars: This also could be implemented in the next version of Celestia. Astronomers detected a planet too far from it's star that Celestia simply don't accept to put the planet in that distance. It's a good idea to put a support for more distant planets to their stars. And it would be
***VERY COOL*** to put a support that permits to create stars very far away from the Milky Way.
This is all the ideas I have for making Celestia a ***MUCH*** better program.
One day, Celestia will have too many real features that I will think that I am really in space and lost in it, seeing incountable number of stars in front of me. Using full screen it will be much better for my eyes and imagination.
Imagine using Celestia with all features that have in the real Universe. And imagine this real universe having other incountable and other real systems, not only planets with a single star, but having multiple stars. Imagine Celestia with an option of switching on and off the flying mode. If you want, you can fly free in space and anywhere. And also in speeds higher than the light speed.
I imagine Celestia with all these real features and having beautill and detailed images.
I imagine visiting an alien world seeing real textures if it like Earth, not only visiting this world, but also seeing real mountains, lakes and models of trees, animals and cities with cars, buildings and people walking.
Celestia definitively will be the best and the most indicated astronomy program, not only because of the very detailed graphics, but also because it is very easy to navigate in space. I know that the guys of NASA use Celestia for educational activities.
But the problem is that with all these features Celestia will occupate at least more than 300 Mb on Hard Disk. Mostly Harmless occupate around this size in my Hard Disk.
I think that Chris will aprove all my ideas or at least some of them to put in the next releases of Celestia.
Chris, I apreciate Celestia very much, because it gave me ideas of what would like an alien world. Continue developing the best astronomy program I've ever saw in my life, the Celestia program.
And because of this I am making a cool alien system.
And in my vision, one day Celestia will turn into a simulator program.
Many thanks for your attention.
KIKINHO