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Mars is real mighty in 1st James Webb observations of Red Planet

IANS
Updated: September 20th, 2022, 16:48 IST
in Sci-Tech, Uncategorized
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Pic Credit: NASA Twitter

Pic Credit: NASA Twitter

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Washington: NASAs James Webb Space Telescope has captured its first images and spectra of Mars that show a region of the planets eastern hemisphere at two different wavelengths, or colours of infrared light.

Whereas the images show differences in brightness integrated over a large number of wavelengths from place to place across the planet at a particular day and time, the spectrum shows the subtle variations in brightness between hundreds of different wavelengths representative of the planet as a whole.

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Astronomers will analyse the features of the spectrum to gather additional information about the surface and atmosphere of the planet, said NASA.

Principal investigator Geronimo Villanueva of NASA’s Goddard Space Flight Center and his team released Webb’s first near-infrared spectrum of Mars, demonstrating Webb’s power to study the Red Planet with spectroscopy.

Since it is so close, the Red Planet is one of the brightest objects in the night sky in terms of both visible light (which human eyes can see) and the infrared light that Webb is designed to detect.

This poses special challenges to the observatory, which was built to detect the extremely faint light of the most distant galaxies in the universe.

Webb’s instruments are so sensitive that without special observing techniques, the bright infrared light from Mars is blinding, causing a phenomenon known as “detector saturation,” said NASA.

Astronomers adjusted for Mars’ extreme brightness by using very short exposures, measuring only some of the light that hit the detectors, and applying special data analysis techniques.

In the future, the Mars team will use this imaging and spectroscopic data to explore regional differences across the planet, and to search for trace gases in the atmosphere, including methane and hydrogen chloride.

Tags: James WebbMarsRed planet
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