Newly discovered Quipu, a superstructure in which galaxies group together in clusters and clusters of clusters, is the ...

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Take advantage of a special 6-7 planet alignment from Earth's perspective. Planets 'line up' in the skies over California in February.

The solar system's biggest gas giant planet orbits an average of 484 million miles from the sun. The fourth planet from the sun, Mars, looks like a star but has a slightly ruddy hue. Mercury will ...