ADSL on its last legs in South Africa

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  By   Daniel Puchert Partially state-owned telecommunications company Telkom announced in its financial results for the year ending 31 March 2025 that its ADSL subscribers had more than halved to under 30,000. According to the company’s operational data, ADSL lines decreased from 64,959 in March 2024 to 29,770. This 54.2% decline highlights that the legacy broadband technology is slowly approaching the end of the road. Telkom’s ADSL business peaked at the end of March 2016 with 1.01 million subscribers — two years after fibre upstart Vumatel  broke ground in Parkhurst . What followed was a sharp decline in Telkom ADSL subscribers. Customers connected to its copper networks decreased by more than 500,000 over the next four years. This was partly driven by Telkom itself, which began actively switching off its copper network in some neighbourhoods. If it did not have fibre in the area, it would offer a “fixed line lookalike” wireless service that ran over its cellular ...

NASA’s Curiosity rover has captured amazing images of clouds on Mars

 Shining, iridescent, noctilucent clouds as seen from the surface of the Red Planet

NASA’s Curiosity Mars rover captured these clouds just after sunset on March 19th, the 3,063rd Martian day, or sol, of the rover’s mission. The image is made up of 21 individual images stitched together and color corrected so that the scene appears as it would to the human eye.
 NASA/JPL-Caltech/MSSS

NASA’s Curiosity rover has captured images of clouds on Mars— as described in its blog post: “wispy puffs filled with ice crystals that scattered light from the setting sun, some of them shimmering with color.”

According to NASA clouds are rare in the thin atmosphere of Mars, but usually form at its equator during its coldest time of year. Scientists noticed that last year — two years ago in Earth time— there were clouds beginning to form earlier than expected, so this year they were ready.

A gif of clouds drifting above Mount Sharp on Mars, taken by NASA’s Curiosity rover on March 19th.
 NASA/JPL-Caltech/MSSS

The images are not only stunning, they’ve provided new insights to the Curiosity team at NASA. The early clouds are at higher altitudes than most Martian clouds— which typically hover about 37 miles above the planet’s surface and are made up of water ice. The higher-altitude clouds are likely made of frozen carbon dioxide, or dry ice, NASA says.

Curiosity provided both black-and-white and color images— the black-and-white photos show the rippled details of the clouds more clearly.

Curiosity took these images of clouds on Mars just after sunset on March 31st.
 NASA/JPL-Caltech/MSSS

But it’s the color photos taken from the rover’s mast camera and stitched together from multiple images that are really breathtaking. NASA describes them:

Viewed just after sunset, their ice crystals catch the fading light, causing them to appear to glow against the darkening sky. These twilight clouds, also known as “noctilucent” (Latin for “night shining”) clouds, grow brighter as they fill with crystals, then darken after the Sun’s position in the sky drops below their altitude. This is just one useful clue scientists use to determine how high they are.

Curiosity also captured images of iridescent “mother of pearl” clouds, with pastel colors throughout. Mark Lemmon, an atmospheric scientist with the Space Science Institute in Boulder, Colorado said in NASA’s post that those colors come from cloud particles nearly identical in size. “That’s usually happening just after the clouds have formed and have all grown at the same rate,” he explained.

NASA’s Curiosity Mars rover spotted these iridescent, or “mother of pearl,” clouds on March 5th, the 3,048th Martian day, or sol, of its mission.
 NASA/JPL-Caltech/MSSS

Lemmon said he marvels at the colors that show up in these clouds; reds and greens and blues and purples. “It’s really cool to see something shining with lots of color on Mars.”

Very cool.


FEATURED VIDEOS FROM THE VERGE

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