Space.com

• Martian Missive: 'Others Will Follow' Film Explores Last Message from Mars October 21, 2017
  A new sci-fi short explores the message that the (fictional) last human to survive a Mars mission sends back to Earth.
• NASA Satellites Captured Rapid Intensification of 4 Recent Hurricanes October 21, 2017
  Rapid intensification occurs when hurricanes strengthen in a short period of time — much like the recent hurricanes Maria, Irma, Harvey and Jose. Using NASA satellites, scientists hope to learn more about how these storms grow and intensify.
• Blue Origin Conducts First Test of BE-4 Engine October 21, 2017
  Blue Origin announced Oct. 19 that it conducted the first successful test of its BE-4 engine, a major milestone for both the company's launch vehicle plans as well as for United Launch Alliance.
• City-Size Lunar Lava Tube Could House Future Astronaut Residents October 21, 2017
  A city-size lava tube has been discovered on the moon, and researchers say it could serve as a shelter for lunar astronauts.
• What is a Wormhole? October 20, 2017
  A wormhole is a theoretical passage through space-time that could create shortcuts for long journeys across the universe.
• How Long Does It Take to Get to Mars? October 20, 2017
  If you wanted to pay a visit to the red planet, how long would it take? The answer depends on a number of things …
• Orionid Meteor Shower 2017: When, Where & How to See It This Weekend October 20, 2017
  Some of the brightest and swiftest shooting stars will bedazzle the night sky this year during the Orionid meteor shower, which will peak between Oct. 20 and 22 and continue through early November.
• 2017 Orionid Meteor Shower Peaks This Weekend: What to Expect October 20, 2017
  Over the next several days, you may get a chance to glimpse a "shooting star" in the predawn hours, as the Orionid meteor shower will be at its peak.
• Image of the Day October 20, 2017
  Amalthea, the largest of Jupiter's inner satellites, casts a shadow on the giant gas planet in this photo taken by NASA's Juno spacecraft.
• Meltwater From Glaciers May Have Flowed on Ancient Mars October 20, 2017
  A study suggests that past temperatures on Mars could have sometimes peaked just above freezing, allowing meltwater to carve out distinctive features.