"Before Hubble we really didn't know that much about the Universe," says Nobel Laurete Professor Brian Schmidt.
It's 25 years since the Hubble Space Telescope was launched. In that time it has revolutionised astronomy and given us thousands of stunning images. Celebrate this important anniversary with 25 of our favourite photos, and listen to StarStuff for a full interview with Professor Schmidt.


Also, in the not-so-big questions department, Dr Karl explores the question of whether you really can test the charge of a battery by dropping it.


And this week's video from the vault contains spectacular footage as marine scientists attempt to understand what would be the natural shark population in a world without humans.