免費星空模擬軟體 – Celestia，讓你能夠像乘坐太空船一般，造訪超過十萬個星球，這軟體擁有種類眾多的恆星、星系、行星、衛星、小行星、彗星和太空船，還有外掛擴充功能。（阿榮）（下載）
The free space simulation that lets you explore 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.
關鍵字：CelestiaPortable
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Source: azofreeware.com