WorldWide Telescope

worldwidetelescope.org/webclient

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A free, open-source virtual telescope that lets you explore the sky, planets and deep-space imagery from real observatory surveys, with guided tours.

Why it is useful

Lets you pan and zoom across the sky and switch between survey wavelengths, from visible light to infrared, in the same view. The guided tours are a good way to learn what you are looking at, and everything runs in the browser.