Particles likely inhabited polar orbits around the newborn Earth–Moon system until the two bodies were separated by roughly 10 Earth radii; at that point, as is the case today, stable polar orbits no longer existed.
Observations with the Keck Cosmic Web Imager spectrograph reveal that the ejected material of the unusual supernova remnant Pa 30 is moving at velocities close to the free-expansion velocity.
By carefully monitoring and taking spectra of artificial objects orbiting Earth, researchers have shown how easily some of these objects might be confused for natural objects like asteroids.
Modeling suggests that the observed gaps in the stellar sequence of open clusters are the result of small-number statistics and other factors, not evidence of the radiative–convective boundary.
The disks surrounding accreting black holes are dense enough for plasma physics effects to be important; new research shows that disks can produce strong iron emission, potentially explaining certain observations.
A new catalog uses deep Hubble Space Telescope data of four Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) fields to provide redshift estimates and physical properties for more than 150,000 galaxies.