Best Reference CD-ROM to understand Space & Astronomy-Any area outside the atmosphere of any celestial body can be considered ''Space''. The field of science which studies this space is called ''Astronomy'' that includes the sun and stars palents coments nebulae which are clouds of gas and dust in space. and galaxies which are large clutering''s of many millions of stars. This CD-ROM/VCD/DVD has exhaustive fact about this astonoshing universe.