Watch eerie green ‘laser lines’ beam across the skies over Hawaii as experts blame ‘digital rain’ on NASA.
AN EERIE display of bright green laser lights lit up the skies over Hawaii just a few days ago.
The strange spectacle was caught on camera – revealing a sudden flash that lasted little more than a second.
Film watchers likened the sight to “digital rain” due to its sci-fi appearance.
The laser lights flashed in the sky over Mauna Kea, a 13,800-foot dormant volcano on Hawaii’s Big Island, on January 28.
But the real cause of the light show was a piece of Nasa technology, experts say.
“On January 28, 2023, the HST, the Subaru-Asahi Star Camera, captured green laser lights in cloudy skies over Maunakea, Hawaii,” the National Astronomical Observatory of Japan explained.
“The lights are believed to be from an ICESAT-2/43613 remote sensing altimeter satellite.”
The camera was attached to a telescope on the iconic summit.
And it shows lasers emitted by an altimeter—a device used to measure altitude.
The satellite in question is designed to track changes in the cryosphere.
This is a collective term for everything on earth where water exists in its solid form.
These include sea ice, lake ice, river ice, snowpack, glaciers, ice caps, ice sheets, and frozen ground.
Part of that surveillance involves firing bright laser beams at the Earth’s surface and then measuring how long it takes for them to bounce back.
This allows the satellite to calculate how far it is from the surface, i.e. its altitude.
“The pulses of light travel through a series of lenses and mirrors before being beamed to the ground,” NASA explains.
“This path along the optical bench is used to start the stopwatch on the timing mechanism, check the wavelength of the laser, set the size of the footprint, ensure the laser and telescope are perfectly aligned, and split the laser into six beams.
“With each pulse, about 20 trillion photons leave ATLAS through its box structure; only about a dozen return to the satellite’s telescope.
“To capture these photons, ATLAS is equipped with a 2.6-foot diameter beryllium telescope.”
The laser can fire 10,000 laser pulses every second.
And that means it can track elevation every 2.3 feet via its ground path along the Earth’s surface.
The Hawaii The camera caught some of the laser beams, resulting in spectacular footage.
https://www.thesun.ie/tech/news-tech/10188644/nasa-digital-rain-laser-light-sky/ Watch eerie green ‘laser lines’ beam across the skies over Hawaii as experts blame ‘digital rain’ on NASA.