Category Science

The End Is Near for NASA’s Voyager Probes

Saturn as captured by the Voyager program. Smith Collection/Gado/Getty Images Once the Voyagers’ planetary journeys were over, it was possible to begin a new mission phase. After their last planetary stops, both probes reached escape velocity for the solar system,…

The Mystery of How Supermassive Black Holes Merge

However, modeling has shown that it is difficult to scatter enough stars toward the black holes to solve the final-parsec problem. Alternatively, each black hole might have a small disk of gas around it, and these disks might draw in…