Astrophysicists have detected 150 supernovas, a record – breaking number in the Subaru deep field – a full moon sized patch of sky – which includes 12 of the most ancient and distant ones. The most ancient explosion can be difficult to spot. While observing the 150,000 galaxies of the Subaru deep field, the team spotted the supernovas in the act of exploding, identifying 150 supernovas in all.