| |
WG3K > ANS 03.11.24 17:37l 8 Lines 3245 Bytes #43 (0) @ AMSAT
BID : ANS308.12
Read: GAST
Subj: Satellite Shorts From All Over
Path: DB0FFL<DB0FHN<DB0BLO<DB0ERF<IZ3LSV<I0OJJ<EA2RCF<LU9DCE<VK2RZ<KC9UHI<
KA1VSC<WG3K
Sent: 241103/1632Z 9781@WG3K.#SMD.MD.USA.NOAM LinBPQ6.0.24
* As millions of people around the world celebrate Diwali, the Hindu festival of lights, NASA astronaut Sunita Williams radioed home a message of festive cheer. "I want to extend my warmest wishes for a Happy Diwali to everyone celebrating the festival of lights today at the White House and around the world," Williams said in a recent video message sent from the International Space Station. Speaking from the ISS' window-filled cupola with Earth as her backdrop, Williams, who is an American with Indian heritage, spoke about her father's efforts to keep Indian culture alive after he migrated to the United States in 1957. She also touched upon the symbolism of Diwali â€ö the triumph of good over evil, light over darkness and hope over despair. "Diwali is a time of joy as goodness in the world prevails," she said. [ANS thanks Space.com for the above information.]
* In a few years, as part of the Artemis Program, NASA will begin the creation of permanent infrastructure that will allow for regular missions to the surface (once a year) and a sustained program of lunar exploration and development. In a recent NASA-supported study, a team of researchers at the University of Illinois Urbana-Champaign investigated a new method of sending spacecraft to the Moon. It is known as “multimode propulsion,” a method that integrates a high-thrust chemical mode and a low-thrust electric mode – while using the same propellant. To break it down, a multimode thruster relies on a single chemical monopropellant – like hydrazine or Advanced Spacecraft Energetic Non-Toxic (ASCENT) propellant – to power chemical thrusters and an electrospray thruster (aka. colloid thruster). The latter element relies on a process known as electrospray ionization (ESI), where charged liquid droplets are produced and accelerated by a static electric field. Electrospray thrusters were first used in space aboard the ESAâ€Ös LISA Pathfinder mission to demonstrate disturbance reduction. By developing a system that can switch as needed, satellites will be able to perform propulsive manuevers using less propellant, thus requiring fewer fuel transfers. Read the complete story at https://tinyurl.com/ANS-308-Propulsion. [ANS thanks UniverseToday.com for the above information.]
* Has orbital debris gone out of control? In 1978, NASA scientists Donald J. Kessler and Burton G. Cour-Palais proposed a scenario where the density of objects in Low Earth Orbit (LEO) would be high enough that collisions between objects would cause a cascade effect. In short, these collisions would create debris that would result in more collisions, more debris, and so on. This came to be known as the Kessler Syndrome, something astronomers, scientists, and space environmentalists have feared for many decades. In recent years, and with the deployment of more satellites than ever, the warning signs have become undeniable. Currently, there is an estimated 13,000 metric tons (14,330 US tons) of “space junk” in LEO. With the breakup and another satellite in orbit – the Intelsat 33e satellite – the situation will only get worse. Read the full report at https://tinyurl.com/ANS-208-Debris. [ANS thanks UniverseToday.com for the above information.]
Lese vorherige Mail | Lese naechste Mail
| |
