天文学

Visualize orbits, relative positions and movements of the Solar System objects in an interactive 3D Solar System viewer and simulator.

The solar system has one star, eight planets, five dwarf planets, at least 290 moons, more than 1.3 million asteroids, and about 3,900 comets.

A different astronomy and space science related image is featured each day, along with a brief explanation.

Find locations suitable for stargazing, a light pollution map, accessibility by car, space to park, travel time & distance, weather conditions and lunar phase.

Find the best places to stargaze in the UK, dark sky locations, observatories, stargazing events and advice to help you see the stars!

App is for astrophotography with your smartphone and takes pictures in RAW/JPEG.

The website of Cary and Michael Huang. Home of the Scale of the Universe as well as other things.

Discover Your Place in the Universe

The Strasbourg astronomical Data Center (CDS) is a data center dedicated to the collection and worldwide distribution of astronomical data and related information. It is located at the Strasbourg Astronomical Observatory, France.

Radio broadcasts leave Earth at the speed of light. Scroll away from Earth and hear how far the biggest hits of the past have travelled. The farther away you get, the longer the waves take to travel there—and the older the music you’ll hear.