The WorldWide Telescope (WWT) is a Web 2.0 visualization software environment that enables your computer to function as a virtual telescope—bringing together imagery from the best ground and space-based telescopes in the world for a seamless exploration of the universe.
Requirements
For PC:
Microsoft® XP SP2 (minimum), Windows® Vista® (recommended)
PC with Intel Core 2 Duo processor with 2 gigahertz (GHz) or faster, recommended
1 gigabyte (GB) of RAM; 2 GB RAM recommended
3D accelerated card with 128 megabytes (MB) RAM; discrete graphics card with dedicated 256-MB VRAM recommended for higher performance
1 GB of available hard disk space; 10 GB recommended for off-line features and higher performance browsing
XGA (1024 x 768) or higher resolution monitor
Microsoft Mouse or compatible pointing and scrolling device
Microsoft® DirectX® version 9.0c and .NET Framework 2.0
Required for some features; Internet connection at 56 Kbps or higher through either an Internet service provider (ISP) or a network. Internet access might require a separate fee to an ISP; local or long-distance telephone charges might also apply