保护地球，探索宇宙，发现文明
2023年12月19日 NGC 1499: The California Nebula Image Credit & Copyright: Steven Powell Explanation: Could Queen Calafia‘s mythical island exist in space? Perhaps not, but by chance the outline of this molecular space cloud echoes the outline of the state of California, USA. Our Sun has its home within the Milky Way’s Orion Arm, only about 1,000...
On Aug. 18, 2023, the Mars Reconnaissance Orbiter (MRO) captured ridged lines carved onto Mars’ landscape by the gradual movement of ice. While surface ice deposits are mostly limited to Mars’ polar caps, these patterns appear in many non-polar Martian regions. As ice flows downhill, rock and soil are plucked from the surrounding landscape and ferried along ...
2023年12月18日 The Same Color Illusion Image Credit: Edward H. Adelson, Wikipedia Explanation: Are squares A and B the same color? They are! To verify this, either run your cursor over the image or click here to see them connected. The featured illusion, an example of the same color illusion, illustrates that purely human perceptions in science may be ambiguous...
In this image from Dec. 17, 1903, Orville Wright makes the first powered, controlled flight on Earth as his brother Wilbur looks on. Orville Wright covered 120 feet in 12 seconds during the first flight of the day. The Wright brothers made four flights that day, each longer than the last. The aircraft, Flyer 1, was wrecked beyond repair after the fourth flig...
“I was on console as a part of the primary launch team [for Artemis I]. I was the Orion system specialist for Guidance, Navigation, and Control. … In a few missions, we’re sending astronauts to the Moon again, so being a part of the very, very first mission [was memorable]. … I wasn’t here in 2017 when they first began discussions, but that within just the f...
2023年12月17日 Geminids over China’s Nianhu Lake Image Credit & Copyright: Hongyang Luo Explanation: Where are all of these meteors coming from? In terms of direction on the sky, the pointed answer is the constellation of Gemini. That is why the major meteor shower in December is known as the Geminids — because shower meteors all appear to come...
2023年12月16日 Crescent Enceladus Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA Explanation: Peering from the shadows, the Saturn-facing hemisphere of tantalizing inner moon Enceladus poses in this Cassini spacecraft image. North is up in the dramatic scene captured during November 2016 as Cassini’s camera was pointed in a nearly sunward directi...
2023年12月15日 Betelgeuse Eclipsed Image Credit & Copyright: Sebastian Voltmer Explanation: Asteroid 319 Leona cast a shadow across planet Earth on December 12, as it passed in front of bright star Betelgeuse. But to see everyone’s favorite red giant star fade this time, you had to stand near the center of the narrow shadow path starting in central M...
2023年12月14日 Supernova Remnant Cassiopeia A Image Credit: NASA, ESA, CSA, STScI; D. Milisavljevic (Purdue University), T. Temim (Princeton University), I. De Looze (University of Gent) Explanation: Massive stars in our Milky Way Galaxy live spectacular lives. Collapsing from vast cosmic clouds, their nuclear furnaces ignite and create heavy elements in their ...
On Aug. 8, 2023, Artemis II crew members (from left) Jeremy Hansen, Victor Glover, Reid Wiseman, and Christina Koch took a photo in front of their Orion crew module at NASA’s Kennedy Space Center in Florida. Announcing the crew and continuing work on the Space Launch System rocket and Orion are part of the significant steps taken this year toward the agency’...