First a meteor exploded over Russia, followed closely by an asteroid fly-by. Now, two comets are expected to put on a naked-eye spectacle for sky watchers in the Northern Hemisphere.

Up first is Comet Pan-STARRS, which gets its funky name from the telescope credited with discovering it in June 2001: the Panoramic Survey Telescope & Rapid Response System in Hawaii.

The comet is already visible through telescopes in the Southern Hemisphere, and it should swing into view over the Northern Hemisphere beginning around March 8.

It's hard to predict exactly how bright Pan-STARRS will be, but you should be able to see it without binoculars or telescopes, said Don Yeomans of NASA's Near-Earth Object Program. It should be about as bright as the stars in the Big Dipper.

"There is a chance that it will be a little brighter than this, but likewise, it might not get quite that bright," said Karl Battams of the Naval Research Lab.

Part of the brightness will depend on how close Pan-STARRS gets to the sun. Comets are made up of water, ice, dust and other elements and minerals, all loosely packed together, Battams said. As a comet gets closer to the sun, the sun's heat causes these elements to melt, spewing out dust and gas in a brilliant tail.

"The closer it gets, the more intense the radiation and the more elements will be melted," he said.

Pan-STARRS is expected to get fairly close to the sun. That's bad news for the comet, but it could be a boon for sky watchers if the comet is brighter and easier to see.

Pan-STARRS also could fall apart and fizzle. But if it survives its sunbath, we should be able to see it low on the horizon in the western sky for a couple of weeks, Battams said.

"About half an hour after sunset would be a good time for people take a look," he said.

Here are some key dates:

March 5: Pan-STARRS will be closest to Earth;

March 10: The comet will pass closest to the sun;

March 12 and 13: The best dates to look for Pan-STARRS; it should emerge in the western sunset sky not far from the crescent moon.

Battams has these viewing tips:

1) Safety first: Don't try to look at the comet until the sun sets. Do not look at the sun using regular binoculars or telescopes. Ever! You'll burn up your eyes.

2) Comet Pan-STARRS will stay close to the horizon, so you'll need to get away from trees and buildings.

3) Look carefully! The sky will still be bright at dusk, which can make it hard to spot comets.

4) If the skies are clear, and you are away from city light pollution, you may be able to see the comet with your bare eyes. If not, use binoculars.

5) If you can't escape the city, try using binoculars.