The self-taught artist Abraham Lincoln Walker worked in his basement on phantasmagorical paintings, discovered by the art world more than 30 years after his death.

Beyond its aesthetic appeal, this perfectly circular Einstein ring has allowed researchers to "weigh" the dark matter at the heart of a galaxy almost 600 million light-years away. The European ...

Space can be a wondrous place, and we've got the pictures to prove ... to "weigh" the dark matter at the heart of a galaxy almost 600 million light-years away. Euclid's 3D map of the universe ...