How exactly do the stars twinkle in the night sky? As it turns out, the answer is full of hot air... and cold air.
Georgina, age 5, wants to know why rainbows are round.
Some people think the sky is blue because of sunlight reflected off the ocean and back into the sky. But that's not the real reason.
It's difficult to get jets - powerful, lightning fast particles - to give up their secrets. The new Square Kilometre Array radio telescope could hold the key to solving jets' mysteries.
The Nobel Prize-winning research on neutrinos is expected to push the boundaries of science and technology.