Thursday , January 21 2021

"Dawn" exhausted gas detector NASA will send "heirs" – Science Exploration – cnBeta.COM

The National Aeronautics and Space Administration (NASA) recently announced that a "dawn" detector controls the fuel it points to exhausted, unable to manipulate its main antenna towards Earth or direct its solar panels toward the sun. Due to lack of mobility, the "Shahar" mission has officially ended. "Dawn" is still in orbit and will remain in place for decades.

So, does Earth need to send a new messenger to the hook? What is the main mission of the new messenger? The US space network took note of the report on November 6.

Need to go deep into the surface of the hook

"Dawn" found that the surface of the hook is dotted with hundreds of strange stresses, a lot of ice water, and organic molecules (the basic components of life). But at the end of the mission "Dawn", scientists still have many great doubts that have not yet been clarified. "To solve these problems, it may be necessary to go deeper into the space of Ceres, because the information obtained from the orbit is still limited," said Paul Schenk, a scientist who participated in Kars' mission and a member of the University's Space Research Association at the Lunar and Planetary Institute.

Need to focus on Okato Crater

Shank said he hoped Galley would send him to investigate the crater. A picture taken in October 2016 by Dawn shows a bright area on a hook, right in the crater. The crater is 92 km wide and contains the largest and brightest bright spots on the hook, and contains salt deposits – residues left by the salty water that freezes from the ground and freezes on the surface, revealing that Ceres' face is warmer than scientists thought.

In addition, the most common mineral in the Okato crater is sodium carbonate, which is also widely found in places with hydrothermal activity on the Earth (including Yellowstone National Park, etc.). Schenk said: "It is well known that certain bacteria can survive in these places."

But it is also said that the survival of bacteria on a hook is "very unlikely" because the heat generated by the effect lasts for a lifetime. It is important to know that the earliest forms of life grew 700 million years after the formation of the earth. "This kind of effect produces hot enough molten ice and produces groundwater, which then rotates in the center, but for tens of thousands to millions of years, the hot zone shrinks and the water continues to freeze."

Schenk said that if Ceres could be a lifelong habitat, the hydrothermal process observed in it could help scientists understand similar processes on other celestial bodies in the solar system, such as a tree that is considered to be most likely to be out of the solar system. Wai Ah, Titan. Like bacteria living in the hydrothermal depths of the Earth, organisms with similar properties on other celestial bodies do not need sunlight, but rather rely on geothermal energy to survive.

As far as the hook is concerned, being hit by other large space rocks seems to be the source of its geothermal energy. Schenck said: "The hydrothermal reaction between impor and the water will of course have minerals on the surface of the hooks, figuring out how this process works on other planets, including Mars, and how these materials come to the surface, etc., to understand all The Solar System The hydrothermal process is very important, even though we have a lot of information about this planet, the chemical properties of the earth's crust are very different from those of Ceres. "

Landing and wandering on a hook

Schenk said that because the Okato crater has some of the conditions required for life to appear on other celestial bodies, many scientists are hoping to send a landing to Kers for further investigation. Ideally, any future task will include a small rover.

"Dawn" can only learn to crumble from orbit, and its closest altitude to the orbit is 35 km, but the Marines detectives on the surface of the Ceres can be obtained by extracting samples and analyzing them in situ or in spacecraft to get more on the composition of the Ceres.

Schenck said that the "dawn" detector uses a spectrometer to determine the elementary composition on the surface of a dwarf planet, but the measurement results are "mostly controlled by materials that are spectral activity and can detect absorption bands of specific wavelengths," whereas carbon materials They are this type of measurement not well displayed, and it may be "fish of the net". "So maybe we should land on the surface to find it."

In fact, already in 2008, scientists began working on a preliminary plan for the next search mission of the KRS. The proposed mission, called Ceres Polar Lander, plans to send a combination of lander vehicles to Ceres, positioning the lander at Arctic Arctic for clues to life. The mission plans to use NASA's soft landing technology to prepare for landing on Mars.Tales Europe Alenia Aerospace and the research team at the University of Nantes in France presented the idea of ​​the mission at the European Planetary Science Conference.

There are no space agencies planning to send new delegations to Ceres, but since Shachar has already retired, this situation may change. However, Schenk said that NASA's entire Kars exploration mission must be tested after a long test, and scientists have a large amount of data from the "dawn" to be screened. "We're just starting to understand Kress, it takes a little time. To understand what we saw. "

Source link