Thẻ: Enlarge this imageEarl Maize (still left)

Cassini’s Saturn Mission Goes Out Inside a Blaze Of Glory

Enlarge this imageEarl Maize (still left), Ca sini program manager at JPL, and Julie Webster, spacecraft operations staff supervisor for that Ca sini mi sion at Saturn, embrace following the Ca sini spacecraft plunged into Saturn on Friday at precisely seven:fifty five a.m. ET.NASA/Joel Kowsky/(NASA/Joel Kowsky)cover captiontoggle captionNASA/Joel Kowsky/(NASA/Joel Kowsky)Earl Maize (left), Ca sini system supervisor at JPL, and Julie Webster, spacecraft operations staff manager for the Ca sini mi sion at Saturn, embrace following the Ca sini spacecraft plunged into Saturn on Friday at precisely 7:fifty five a.m. ET.NASA/Joel Kowsky/(NASA/Joel Kowsky)Up to date at 12:30 p.m. ET Controllers at NASA’s Jet Propulsion Laboratory sent a last command Friday morning for the Ca sini spacecraft orbiting Saturn. Not extended soon after, accounting for your large distance the me sage traveled, the order was received, placing the craft right into a suicidal swan dive through which it plummeted to the ringed planet’s atmosphere. Ca sini’s ultimate image of Saturn.NASA/JPLhide captiontoggle captionNASA/JPLFlight Director Julie Webster known as “lo s of signal” at about 7:fifty five a.m. ET, accompanied by Venture Supervisor Earl Maize a serting “end of mi sion” as being the spacecraft started to break up in Saturn’s atmosphere. “Congratulations for you all,” Maize declared to applause. “It’s been an unbelievable mi sion, extraordinary spacecraft, and you happen to be all an incredible group.” Earth been given @Ca siniSaturn’s ultimate signal at 7:55am ET. Ca sini has become part of the earth it examined. Many thanks for that science #GrandFinale NASA (@NASA) September 15, 2017 With Ca sini functioning on vacant and no gas station for approximately a billion miles, NASA chose to go out Thelma & Louise-style. But rather than careen into a canyon, the plucky probe took a closing plunge into your object of its obse sion. Just how obse sed? Its 13-year mi sion to explore the strange world of Saturn went on nearly a decade longer than planned. It completed 293 orbits of the world, snapped 400,000 photos, collected 600 gigabytes of data, discovered at least seven new moons, descended to the famed rings and despatched its Huygens lander to a succe sful 2005 touchdown on the surface of yet another moon, Titan. Ca sini’s Saturn Mi sion Goes Out In a very Blaze Of GloryA small sample of some in the 400,000 images shot by Ca sini during its mi sion to Saturn.Hide captionWith giant Saturn hanging in the blackne s and sheltering Ca sini from the sun’s blinding glare, the spacecraft viewed the rings as never before. A photo returned in February 2016.PreviousNextNASA/JPL/Space Science Institute Cover captionA wave structure known because the Janus 2:1 spiral density wave in Saturn’s B ring returned earlier this month.PreviousNextNASA/JPL-Caltech/Space Science Institute Hide captionA composite returned in December 2015 shows an infrared view of Saturn’s moon Titan.PreviousNextNASA/JPL/University of Arizona/University of Idaho Conceal captionAn picture taken just days ago clearly shows the large gap in the middle from the ring known as the Ca sini Division. It was discovered by Giovanni Ca sini, the 17th century astronomer for whom the probe is named.PreviousNextNASA/JPL-Caltech/Space Science Institute Conceal captionThe moon Tethys appears to float among the rings in an graphic returned to Earth on Feb. 8, 2016.PreviousNextNASA/JPL/ Space Science Institute, Boulder, Colorado Disguise captionA rare graphic shows Earth, a billion miles away, behind Saturn’s rings. Returned in July 2013.PreviousNextNASA/JPL-Caltech/Space Science Institute Conceal captionSaturn’s polar “hexagonal storm” could engulf the entire Earth.PreviousNextNASA/JPL-Caltech/Space Science Institute Cover captionThe tortured surface of Saturn’s moon Enceladus tells the story of the ancient and present struggles of one tiny world.PreviousNextNASA/JPL-Caltech Hide captionThis image shows a region in Saturn’s outer B ring.PreviousNextNASA/JPL-Caltech/Space Science Institute Hide captionA false-color picture of Hyperion reveals crisp details acro s the strange, tumbling moon’s surface. The view was obtained during Ca sini’s close flyby on Sept. 26, 2005.PreviousNextNASA/JPL 1 of 10iView slideshow First, Ca sini had to get to Saturn. The Scooter Gennett Jersey year it blasted off, 1997, the “information superhighway” was just getting up to speed. By the time it arrived, in 2004, a Harvard student named Mark Zuckerberg had just launched something identified as Facebook.On its way towards the sixth planet, Ca sini set a couple of circuitous course, swinging by Venus twice to get a gravity a sist that shot it back past Earth and onward to Jupiter before a last marathon leg to Saturn. The twin Voyagers swung by Saturn in the 1970s and ’80s, giving scientists a rough outline with the planet and its moons. Ca sini has filled in many of your details, giving us an unparalleled look. Much of what Ca sini found concerned Saturn’s moons. Among other things, the probe discovered water spewing from Enceladus, that Hyperion has a statically charged surface and that Saturn’s entire moon system a virtual mini solar system in itself exchanges dust and chunks of material with the planet’s ring system. “Two of those moons have been of particular interest,” NPR’s Joe Palca reports from JPL headquarters in Pasadena, Calif. “Titan, with its methane lakes and Enceladus, with its geysers of salty water. Scientists speculate that both moons may have the right conditions to harbor some form of life, although Ca sini did not have instruments capable of detecting life.” One of Ca sini’s crowning achievements came in April of this year, as it spun through a narrow gap in Saturn’s rings, beaming back images and making scientific measurements along the way. Why conclude the mi sion? Although Ca sini’s main power is supplied by radioisotope thermoelectric generators, or RTGs e sentially nuclear batteries that were still going at mi sion’s end the fuel supply for the probe’s main engine and backup was believed to be running low. “We don’t have a gasoline gauge. It would be really nice if we did,” Molly Bittner, a systems engineer at JPL who has worked on Ca sini to the past four years, tells NPR. Instead, mi sion controllers had to estimate the amount of fuel used by each maneuver. And there had been lots of maneuvers since 2004. NPR’s Adam Cole, who helped produce a video commemorating the spacecraft’s life and times, says: “Scientists [were] worried that when [Ca sini] loses power, it could crash into a pristine moon, contaminating a place where we might someday search for life.” NPRYouTube However, there’s another reason for ending the mi sion in such a spectacular fashion: “We have the opportunity to do some really cool science,” Bittner says. While Ca sini has discovered a lot of interesting things about Saturn, its ring system and its moons, there’s one thing it hasn’t been able to pin down with certainty how extensive a Saturnian day lasts. “It’s a little bit Reggie Sanders Jersey embarra sing to confe s, but we don’t know how very long a day is on Saturn,” Michele Dougherty of Imperial College in London tells NPR’s Palca. She’s the scientist in charge of Ca sini’s magnetometer, an instrument that measures Saturn’s magnetic field. Dougherty is hoping that as Ca sini spiraled in the environment, the onboard magnetometer detected a telltale tilt in the magnetic field that should resolve the uncertainty over the length of a Saturnian day, Joe reports. Bittner says that in the last moments of Ca sini’s life, another instrument, the Ion and Neutral Ma s Spectrometer, or INMS, was to open up, sucking in the ambiance to figure out what it truly is made of.