Planetary alignments aren't rare, but they can be when they involve six of the eight planets in our solar system.

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

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The Red Planet will be at its closest point to Earth, also known as perigee, on Jan. 12 and will be exactly opposite the sun ...

Venus and Saturn are currently in conjunction, meaning the planets appear close together in the night sky from Earth. These ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

So I grabbed my camera, ran outside, and looked up just as Mars was supposed to emerge from the Moon's curved horizon. Seen ...

The ‘Martian dichotomy’ is one of the Solar System’s greatest mysteries – but new research in closing in on a solution.

Tonight, stargazers can see a rare "planet parade" as six planets form a visible arc: Mars, Jupiter, Uranus, Neptune, Saturn, ...

Emily Simpson has loved space since she was a 10-year-old kid celebrating her birthday at a planetarium. Now a recent Florida ...

It’s a term used by astronomers to describe when Earth, Mars and the Sun align. When this happens, Earth sits directly ...

The Sun is the center of orbit for every planet in the Solar System. The Earth ... Unable to view our graphics? Click here to see them. Mars' opposition occurs about every two years and ...