Power to the people: New material developed by physicists in South Korea generates electricity as it moves.
In this view from the Hubble Space Telescope, a massive galaxy in a cluster of galaxies produces multiple images of a single distant supernova behind it. The images of the exploding star are arranged in a cross-shaped pattern called an Einstein cross. In the enlarged inset view, arrows point to the four images.
Today, astronomers read the history of the universe by looking at the light emitted by hot, distance objects. Sometimes, however, those light sources give out — and their light disappears. Good news: A new technique might be able to still read the information that had been carried in that long-gone light.
By watching for light’s ‘echoes,’ physicists think they can retrieve information being relayed by or as light. It could make it possible for astronomers to view distant objects without having to see the light they cast off.