Even if you could measure three black holes' locations as precisely as physically possible, you still might not know where the black holes would go. Such a trio's complex dance can be so chaotic that the motions are fundamentally unpredictable, new computer simulations show.
In this new Hubble image two objects are clearly visible, shining brightly. When they were first discovered in 1979, they were thought to be separate objects - however, astronomers soon realised that these twins are a little too identical! They are close together, lie at the same distance from us, and have surprisingly similar properties.
This craggy fantasy mountaintop enshrouded by wispy clouds looks like a bizarre landscape from Tolkien's The Lord of the Rings.
This image of a pair of interacting galaxies called Arp 273 was released to celebrate the 21st anniversary of the launch of the NASA/ESA Hubble Space Telescope.