astrophysics

From CNN, Nov. 20, 2018: Fermilab scientist Don Lincoln talks about a stellar stream called S1, which consists of nearly 100 stars of similar age and composition, orbiting the Milky Way in a direction exactly opposite that of normal stars.

Gravitational lenses

Predicted by Einstein and discovered in 1979, gravitational lensing helps astrophysicists understand the evolving shape of the universe.

From Spektrum, July 2, 2018: Woher stammen die Sterne der Milchstraße? Eine Himmelskartierung stößt auf eine Reihe von Besuchern – Sternströme aus fremden Galaxien.