It is due to reach the planet Mercury in 2011.

Because of its proximity to the sun, the planet Mercury is often difficult to see.

In 2008 a crater on the planet Mercury was named for him.

Its mass is roughly half that of the planet Mercury.

A crater on the planet Mercury has been named after him.

The planet Mercury has often been used as a setting in science fiction.

It is a large moon, only slightly smaller than the planet Mercury.

The first measurement of this effect, for the planet Mercury, dates back to 1859.

An impact crater on the planet Mercury also bears his name.

Either the moon or the planet Mercury was passing across the sun's disk.

It is due to reach the planet Mercury in 2011.

Because of its proximity to the sun, the planet Mercury is often difficult to see.

In 2008 a crater on the planet Mercury was named for him.

Its mass is roughly half that of the planet Mercury.

A crater on the planet Mercury has been named after him.

The planet Mercury has often been used as a setting in science fiction.

It is a large moon, only slightly smaller than the planet Mercury.

The first measurement of this effect, for the planet Mercury, dates back to 1859.

An impact crater on the planet Mercury also bears his name.

Either the moon or the planet Mercury was passing across the sun's disk.