After 48 years, Voyager probes are running out of plutonium. So NASA has taken extreme measures

The emblematic Voyager 1 space probes and Voyager 2, launched almost 50 years ago, are running out of energy. In order not to lose them, NASA has made the decision to turn off two other instruments to extend its useful life. One less instrument in each Voyager. Last February 25, NASA reveals nowthe mission team turned off the cosmic rays subsystem of the Voyager 1 probe, which studied high -energy particles in the interstellar space. The instrument has been doing science all this time and in 2020 allowed first How electrons from the sun accelerate when bouncing in shock waves as they move outside the solar system. Voyager 1 is the object manufactured by humans that is farther from earth and that has been going into the interstellar space more time. On March 24, NASA will also turn off the instrument that measures low -energy loaded particles in the Voyager 2. These movements seek to reduce the energy consumption of the probes, which depend on a radioisotope generator whose plutonium is running out. Both lose about 4 watts of power every year. There are hardly any operational instruments. NASA has been turning off the functions of the Voyager to prolong your useful life. Of the 10 scientific instruments Originals, only three will continue to function in each of the twin probes, one of them for just a few months: The magnetometer: measures the strength and direction of the magnetic field in the confines of the solar system, helping to understand how the magnetic field of the sun and the magnetic field of interstellar space interact The plasma wave subsystem: detects electromagnetic and plasma waves, providing information on the density and plasma temperature in interstellar space In the Voyager 1, the instrument of low -energy loaded particles, which NASA plans to also deactivate at the end of 2025. In the Voyager 2, the cosmic rays subsystem, which will remain operational until 2026 A growing repair history. In May 2024, after six months without receiving legible scientific data due to the degradation of the internal memory of Voyager 1, NASA achieved restore information through a complex (And almost heroic) Software update. It had already passed in 2010 with Voyager 2, but on that occasion It was solved With a restart. Not only memory is failing. In September 2024, engineers had to light secondary propellants of the Voyager 1, inactive for decades, to correct the orientation of the probe due to an obstruction of its main engines, also the result of its longevity. The procedure implied careful temporal heating of inactive engines, but was successful and allowed to continue with the mission. NASA expects them to reach 2030. Suzanne Dodd, head of the Voyager project, said in a statement that turning off instruments is a crucial step to avoid the “premature” purpose of the mission. Thanks to these adjustments, both ships could continue to send scientific information at least until the 2030s, although with a progressive reduction of their abilities. As for the “premature”: the Voyager have widely overcome their original mission, whose initial plan was to explore Jupiter and Saturn. Thanks to excellence in their engineering and these constant adjustments, the ships have continued to work beyond what is expected, revealing unique information about interstellar space and heliopause, the region where the solar wind loses its influence. Images | POT In Xataka | The rescue of Voyager 1 has begun. With 8 kb of memory, a programming language of 1957 and an unimportant LAG

There is a 2% probability that the asteroid impact the earth, but we will not know how much it measures until the webb observes it

He Asteroid 2024 YR4 He has aroused unusual interest since his discovery on December 27. Although the probability of impact with the earth remains very low, has risen from 1 to 2% As new observations are obtained. However, astronomers are having difficulty measuring their size and have decided to resort to the most powerful space telescope in history to get out of doubt. There is a problem in how an asteroid is measured. Until now, the size estimates of 2024 YR4 have oscillated between 40 and 90 meters in diameter, a too wide range to assess the danger that would represent an eventual impact with our planet. This lack of precision has a reason and is that The size of the asteroid is calculated from the reflected visible lighta method that depends on the reflectivity of its surface. 2024 YR4 could be an object of 40 meters very reflective or an object of 90 meters very dark. As well as any intermediate option. The James Webb space telescope to the rescue. Unlike other observatories, The 10,000 million dollar telescopeoperated by NASA, ESA and the Canadian space agency, does not observe the visible spectrum, but the infrared spectrum, and with an unprecedented sensitivity. Astronomers will allocate hours of webb use to analyze the infrared light emitted by the asteroid to obtain a more precise measurement of its size and temperature. With luck, it will allow them to discern whether 2024 YR4 is at the lower or upper end of the estimated range, crucial information to better evaluate the consequences of their unlikely but possible impact. Two rounds of observation are planned. Space agencies have foreseen Two rounds of crucial observations With the Webb Telescope. The first will take place in early March, when the asteroid is at its point of greatest brightness and visibility for the telescope. The second round, scheduled for May, will allow scientists to study how the object temperature varies as it moves away from the sun, in addition to continuing to obtain data on its trajectory when the object has ceased to be visible by terrestrial telescopes. Why fluctuate the probability of impact. The 2% estimate is the most up -to -date ES has provided so far (NASA publishes a 2.1% estimate). The figure varies constantly because the calculations have been incorporating new observations that reduce the uncertainty of their trajectory. These fluctuations are, in fact, typical behavior in the estimation of the impact risk of newly discovered objects. NASA planetary defense equipment and ESA are based on orbital dynamic systems (such as Scout, Sentry, Meerkat and Aegis) that generate multiple possible trajectories for the asteroid. As less likely orbits are discarded, targeting on Earth may increase the fraction of possible impacts, although, over time, additional observations allow the threat to definitively discard. If this were not the case with 2024 YR4, we would be talking about a meteorite that could fall in countries as populated as Colombia, Nigeria or India on January 22, 2032. Then we would start talking about a mission to divert it, a task in the that We already have some practice. Image | Two of the 18 mirrors of the Webb Telescope (NASA/C. GUNN) In Xataka | The impact probability of asteroid 2024 YR4 has risen to 1.6%. The UN has already activated a special protocol

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