Mercury will be in the daytime sky next week as it crosses the face of the sun.
The planets only line up like this a little more than once a decade. Mercury will be visible from almost everywhere on Earth — except Australia, bits of Oceania and Antarctica.
"It will take about 7 1/2 hours for the tiny planet's disc to cross the sun completely. Since Mercury is so tiny, it will appear as a very small, round speck, whether it's seen through a telescope or projected through a solar filter," said NASA's Jane Houston Jones.
This always bears repeating: Do not look directly at the sun without protection. Besides, Mercury is so small, you'll need a telescope with a solar filter to see it.
And it will have the best seat in the house: Three NASA satellites will gather data on the transit.