At the Suncor Family Day breakfast, under what locals called a clear "Alberta Blue" sky, thousands of hungry Stampeders were already in line by 6:30 a.m.

WSJ: In Calgary, Stampede Fans Flip Over Pancake Bashes

The trailer-mounted radar is a "phased array" type - it scans the sky with a narrow beam which flicks between thousands of locations each second.

BBC: Fact file: Patriot missile defence

Its thunderous rise into a bright but cloudy morning sky over the Kennedy Space Center in Florida was watched by hundreds of thousands of spectators.

BBC: Shuttle Endeavour launches one last time

The meteor exploded Friday in the air near Chelyabinsk, leaving behind nothing but meteorites, thousands of broken windows and some pretty spectacular video of it streaking across the sky before exploding in a noisy, luminous fireball.

CNN: Russian scientists track down fragments of Urals meteor

Old-fashioned planetarium projectors used a metal sphere, pierced with thousands of holes and illuminated from within, to mimic the starry sky.

ECONOMIST: The joys of indoor star-gazing