Quiet quasar has apparently eaten its fill
Astronomers have announced that a distant quasar ran out of gas. Their conclusions clarify why quasar SDSS J1011+5442 changed so dramatically in the handful of years between observations.
Astronomers have announced that a distant quasar ran out of gas. Their conclusions clarify why quasar SDSS J1011+5442 changed so dramatically in the handful of years between observations.
Thanks to a new experimental technique, scientists have now measured a crucial fusion reaction, involving hydrogen and a rare isotope of oxygen, that occurs inside stars.
A trio of brightly pulsating stars at the outskirts of the Milky Way is racing away from the galaxy and may confirm a method for detecting dwarf galaxies dominated by dark matter and explain ripples in the outer disk of the galaxy.
One dozen flight mirrors are now installed on NASA’s James Webb Space Telescope, out of the eighteen mirror segments that make up the primary mirror. The assembly of the primary mirror is an important milestone for the Webb telescope, but is just one component of this huge and complex observatory.