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.
Astronomers have made the most detailed study yet of an extremely massive young galaxy cluster using three of NASA’s Great Observatories. This multiwavelength image shows this galaxy cluster, called IDCS J1426.5+3508, in X-rays recorded by Chandra in blue, visible light observed by Hubble in green, and infrared light detected by Spitzer in red. is so far away that the light detected is from when the universe was roughly a quarter of its current age. This is the most massive galaxy cluster detected at such an early age.
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.
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