October 15, 2017 It should be the 20th anniversary of the Cassini, but it was not the day. Tomorrow (Beijing time on the evening of September 15), Cassini will perform from the United States National Aeronautics and Space Administration (NASA) the last directive: self-burning. The interstellar spacecraft at the end of the 20th century will ignite the thruster and head into the Saturnic atmosphere, blending the 13-year gaseous planet.
The code for this task is: Grand Finale. In the process of gradual burning, vaporization, melting into the Saturn’s atmosphere, the Cassini’s high-gain antenna will remain at the earth, transmitting precious data until the signal disappears.
Why do you want to burn yourself? In fact, Cassini in 2008 to reach the design life, and now, the twilight of the spacecraft will be “oil to light”. NASA decided to “commit suicide” in order to avoid the loss of the power of the spacecraft hit Saturn’s satellite, destruction of follow-up detection mission. Among them, Titan and Titan have the conditions of life, is the focus of protection of the object.
fly to Saturn: 7 years 3.5 billion km
October 15, 1997, Cassini launched from Qana Vera corner of the United States Launched, carrying the European Space Agency’s Tottori Landing Detector “Huygens”. On October 15, 1997, the Cassini was launched from the Cape Canaveral in the United States. From Earth to Saturn, Cassini flew for seven years. It borrowed the gravitational slingshot, twice swept through Venus (April 1998 and June 1999), once swept through the Earth (August 1999), once swept by Jupiter (December 2000), and finally arrived in Saturn.
However, such a leveraging flight, not more time-consuming, and significant savings in fuel. At 12:00 on July 1, 2004, Cassini entered Saturn’s orbit. Saturn’s revolution cycle is 29 times the Earth, that is, the end of his life, Cassini is almost accompanied by Saturn “six months.” At this moment, Saturn’s northern hemisphere winter is beginning to subside. In 2008, after completing the first four-year mission, the scientists arranged for the second phase of the Cassini’s two-year mission: to observe Saturn’s arrival at day and night, when the sun shone on the side of Saturn’s ring , Saturn and Saturn rings change. After that, the Cassini’s service period has been extended for seven years, continue to explore Titan and Titan. Enceladus (Enceladus) is a snow-covered “ice month”, ice layer (2) Hidden under the flow of the ocean. In 2015, Cassini detected carbon dioxide and a lot of hydrogen from the plume sprayed from the cracks in the ice. Scientists believe that this is the ice under the soft sea and submarine rock caused by the reaction between the water and heat. Hydrothermal reactions can provide energy for deep sea microbes.
Enceladus (Enceladus) is a snow-covered “ice month”
hydrogen and carbon dioxide can be synthesized methane. Scientists have found that there is a unique hot spring ecosystem in the deep sea of the earth. In the sun can not take place, methane can also feed the sea near the hot springs of microorganisms. Titan is the Greek mythology of the giant family, known as the Titan (Titan) is the Greek mythology of the giant family, known as Titan (Titan) The name of Titan is Saturn’s largest satellite, is also the second largest satellite in the solar system, only in the Europa three. Titan is also the only solar system known to have a real atmosphere of the satellite.
Scientists have always wanted to know what is hidden in Titan’s dense atmosphere? Snow, sea, and even life Cassini is not the first visitor sent by mankind. Has been flying to the edge of the solar wind “Traveler No. 1” and “Traveler No. 2”, have been rush passing.
On October 24, 2004, Cassini returned the first batch of Titan photos and data. December 23, 2004, Cassini released Huygens number. January 14, 2005, Huygens successfully landed Titan six. December 16, 2005, Huygens floating in the night under the “Methane Lake” Cassini and Huygens together, opened the Titan atmosphere under the true face : This is a world in the climate and geography closest to the earth, there is a hint of life.
Titan’s surface temperature is about zero179 degrees Celsius, no water only ice, but has a “methane sea” and “methane river”, under the “methane rain”, the sky floating “methane cloud”.
These “methane rivers” flow through the deep canyon, into the “methane sea”, washed out the pebbles in general ice.
ice on the Titan “Methane Lake”
Titan’s equatorial region six, full of barren sand dunes, and Nabimiya and similar Saharan landscape, made up of organic matter from the atmosphere The In addition, Titan also suspected of the existence of a volcano. If that is really a volcano, that jet will not be magma, but muddy boiling water. In Titan, humans may observe the process of life in the budding of organic matter.
On 11 September, the Cassini flew over Titan in 11.9 million kilometers, which was the last and last time the Cassini was from Titan. With Titan’s gravity, Cassini went straight to Saturn’s atmosphere to meet the ultimate fate. Engineers called the Cassini and Titan the last side “goodbye”.
13 years with Saturn, Cassini’s main task is to pat. NASA official website shows Cassini number shooting all the more than 390,000 photos.
What is Saturn, Saturn and Saturn Moon in the eyes of Cassini? Let us recall the “Hall of Fame” works.
November 2012 and September 2016, Saturn’s Arctic Color Change
Saturn’s shadow does not block all halos
Saturn’s Arctic “rose” whirlpool (false color)
soil (6) Titan’s Antarctica near the Antarctic Snake Landform Saturn’s Moon ” Quintet “ Titan” La Pater “is a yin and yang face
deformed Titan eleven” Yibi Mai Hughes “, small satellites too” bitter “
Titan sixteen” Pro Mississippi “and the strange F ring
Our Blue Star
Beijing time on September 15 at 4 pm, Cassini will take the last photo.