ブライアン・メイのインスタグラム(brianmayforreal) - 7月27日 10時28分

You CAN free view this in 3-D !!!
Ace Astrophotographer Damian Peach was kind enough to send me a different pair of images of Mars to mount as a stereo pair (the top pair - 5th June). This time the time elapsed between exposures was - as you can see from the small grey time logs underneath - almost exactly half an hour. Now Mars spins on its axis once every 24 and a half hours - almost exactly the same as the Earth's day. So in half an hour it's rotated about 8 degrees. This gives us a stereo baseline twice as big as for the the bottom pair of images - and to my eyes the effect is much better - the planet really does look like a ball. You think ?! The top image shows - high up on the left limb - the biggest volcano in the Solar System - Olympus Mons - nearly three times as high as Mount Everest - and 100 times bigger across than any volcano on Earth.
You CAN free view this in 3-D ! Just hold your phone up about 20 cm from your face and look past it, over the top. At something about a metre away. See how the 'balls' float sideways? First you'll see four balls instead of two (well - 8 in all!) then if you move the phone gently forward and back, the two middle ones will overlap and combine into one - (giving three balls top and bottom) NOW - become aware that this centre ball is coming into focus and - it's gloriously 3-D ! So now you free-viewed Mars in stereo ! OK? How was it ? Cheers - Bri

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