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An asteroid the size of a city block is expected to pass Earth tonight.

The huge space rock, 2012 LZ1, may fly by close enough for earthlings to watch it online, Space.com reports.

Experts estimate the asteroid will cruise by at a distance of about 5.4 million km (about 14 times the distance between the Earth and the moon) but won't be close enough to view with the naked eye. It will, however, be close enough to the planet to be classified a "potentially hazardous" asteroid, the astronomy website reports.

Experts with Slooh Space Camera will broadcast a live feed from a telescope in the Canary Islands.

Watch it at 8 p.m. ET.