Europa and Jupiter from Voyager 1

Reshared post from +Astronomy Picture of the Day (APoD)

Europa and Jupiter from Voyager 1
Image Credit: NASA, Voyager 1, JPL, Caltech; Processing & License: Alexis Tranchandon / Solaris
https://apod.nasa.gov/apod/ap170905.html

What are those spots on Jupiter? Largest and furthest, just right of center, is the Great Red Spot — a huge storm system that has been raging on Jupiter possibly since Giovanni Cassini's likely notation of it 352 years ago. It is not yet known why this Great Spot is red. The spot toward the lower left is one of Jupiter's largest moons: Europa. Images from Voyager in 1979 bolster the modern hypothesis that Europa has an underground ocean and is therefore a good place to look for extraterrestrial life. But what about the dark spot on the upper right? That is a shadow of another of Jupiter's large moons: Io. Voyager 1 discovered Io to be so volcanic that no impact craters could be found. Sixteen frames from Voyager 1's flyby of Jupiter in 1979 were recently reprocessed and merged to create the featured image. Forty years ago today, Voyager 1 launched from Earth and started one of the greatest explorations of the Solar System ever.

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The blue horizontal lines are parallel

Reshared post from +Winchell Chung

The blue horizontal lines are parallel. Squint at them and you'll see.

This Optical Illusion Is Blowing the Internet’s Collective Mind
Terrific optical illusion by Victoria Skye. @RichardWiseman @chriscfrench pic.twitter.com/IeSFupAcfU— Martin S Taylor (@martinstaylor) August 7,

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"The results show the biggest subsidised deals are on the iPhone 7, whereas…

"The results show the biggest subsidised deals are on the iPhone 7, whereas MTN and Cell C generally give the largest subsidies."

Reshared post from +Mail & Guardian

Committing to a two-year cellphone contract is not really an angst-ridden experience for most South Africans.

Cellphone costs are a wake-up call
Analysing the hidden costs of a contract should make you think carefully before you sign up.

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