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An endless line of empty blue gas cylinders wrapped around several tree-lined blocks of apartments.

Khawla crouched next to a blue gas canister on top of which was perched a pot of yellow lentil soup.

He carries a blue gas canister.

One evening this week, as Bradley scanned scores of protesters filing past the barbershop, he spotted a young black man wearing a red, white and blue gas mask.

Here's a list of the top exoplanet finds of 2013, from a tiny world about the size of Earth's moon to a blue gas giant on which it rains molten glass: