We might not be ready to set foot on Mars (even if we can grow potatoes), but that doesn't mean you can't have an amazing time coasting through the vacuum of space. Celestia is a free simulator that lets you explore the furthest reaches of the Milky Way, without the perils of rapid decompression, starvation and extreme solar radiation. Always an advantage.

Celestia is a full 3D rendering of our galaxy, including planets, stars, satellites and other celestial bodies. There are even models of…

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