Around the time of your romantic dinner, head outside and look to the southwest to spot the super brilliant planet in the night sky ...

Four planets will be widely visible to the naked eye through part of February, but calling them a 'planetary alignment' may ...

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

This arc is known as the ecliptic — the plane on which the planets orbit the sun. From our viewpoint on Earth ... Mercury, ...

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

I pick out North America’s celestial highlights for the week ahead (which also applies to northern hemisphere mid-northern ...

The four-planet lineup that began in January concludes by mid- to late February, as Saturn sinks increasingly lower in the ...

Like a celestial parade across the cosmos, five bright planets are lighting up the night sky and visible with the naked eye ...

Mercury takes only 88 Earth days to orbit the sun.

Each planet takes a different length of time to orbit the sun: Venus, for instance, completes one orbit in 225 days, while Mercury zips around the star in 88 days and Saturn takes 29.4 years to ...