<ul><li>NASA's SPHEREx space observatory has started mapping the entire sky in 3D, capturing hundreds of millions of galaxies.</li><li>The spacecraft will take about 3,600 photos per day for the next two years to complete the extensive mapping task.</li><li>SPHEREx uses a system of spinning reaction wheels and six separate detectors for specific light wavelengths to capture images.</li><li>The observatory's unique spectroscopy technique allows it to create a detailed 3D map, study cosmic objects' compositions, and provide insights into the early universe.</li></ul>

NASA’s new space observatory is mapping the entire sky in 3D

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