What causes unusual knots of gas and dust in planetary nebulas? Seen also in the Ring Nebula, the Dumbbell Nebula and NGC 2392, the knots' existence was not initially predicted, and their origins are still not well understood. Pictured here is a fascinating image of part of the Helix Nebula by the James Webb Space Telescope showing tremendous detail in infrared light. The cometary knots have masses similar to the Earth but have sizes typically several times the orbit of Pluto. One hypothesis for the fragmentation and evolution of the knots includes existing gas being driven out by a less dense but highly energetic stellar wind of the central evolving star. The Helix Nebula is one of the closest examples of a planetary nebula created at the end of the life of a Sun-like star. Given a technical designation of NGC 7293, the Helix Nebula lies about 650 light-years away towards the constellation of Water Carrier (Aquarius). Open Science: Browse 4,000+ codes in the Astrophysics Source Code Library
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HELSINKI — China sent a new pair of secretive satellites into a programmatically new orbit Wednesday, while also upgrading its on-orbit communications relay capabilities. A Long March 6A rocket lifted […] The post China launches secretive TJS-27 pair, orbits next-gen Tianlian relay sat appeared first on SpaceNews.
Converting an engineering model of a Mars rover into an actual lunar rover could cost NASA more than $1 billion, an estimate strongly rejected by the agency’s administrator. The post Sending repurposed Mars rover to the moon could cost more than $1 billion appeared first on SpaceNews.
WARSAW, Poland — The Spanish government announced it will allocate between 1.6 billion and 2 billion euros ($1.8 to $2.3 billion) to develop a national military satellite communications constellation that […] The post Spain commits up to $2.3 billion for national military communications for IRIS² appeared first on SpaceNews.
The Space Force Association’s National Spacepower Center is building an unclassified environment for demonstrating threats to satellites and their consequences on Earth The post Inside the effort to show Congress what war in space looks like appeared first on SpaceNews.
Vendors will compete for orders to build satellites, sensors and systems for more realistic military space exercises The post Space Force picks 15 companies for $981 million training range contract appeared first on SpaceNews.
A NASA official says that work with Boeing on the company’s CST-100 Starliner vehicle is making “good progress” but declined to offer a date when the spacecraft could fly again. The post NASA still assessing Starliner-1 flight opportunities appeared first on SpaceNews.
