From Earth to the Universe: Picture of the day


GRAVITATIONAL LENSING

The combined gravity of a cluster of galaxies can act as a cosmic lens. In this Hubble Space Telescope image, a rich cluster (yellow) bends the light from more distant galaxies, leaving them as blue streaked arcs. Studying the shapes and positions of these images, astronomers find there isn't enough visible matter to account for the distortions, so there must be a large amount of invisible dark matter present.

Credit: Image made in visible light by M. Lee and H. Ford for NASA / ESA / JHU.

In 2009, the "From Earth to the Universe" project brought astronomy to millions of people around the world. Take a tour of just some of the locations in a short video on the FETTU Highlights page.