A ‘superflare’ 10 trillion times brighter than the Sun is confirmed as the record-holder for both luminosity and distance.

Years ago, David Toomey picked up H. G. Wells' The Time Machine and couldn't put it down. He was most interested in the drawing-room discussion between the time traveller and his friends in which time ...

We measure the “warmness” of the dark matter, i.e. the comoving root-mean-square thermal velocity v hrms (1) , with nearly 3000 spiral galaxy rotation curves in the ...