๐Ÿš€ ๅฎ‡ๅฎ™ใฎ่จ˜ๆ†ถใƒปใ‚ซใƒฌใƒณใƒ€ใƒผๆคœ็ดข
ใใ‚‡ใ† ใƒฉใƒณใƒ€ใƒ 
ๆ˜ฅๅˆ†็‚นใฎๅœŸๆ˜Ÿ Saturn at Equinox
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ๅœŸๆ˜Ÿใฎ็’ฐ้ขใŒๅคช้™ฝใฎ็œŸไธŠใ‚’ๅ‘ใ„ใฆใ„ใŸใ‚‰ใ€ๅœŸๆ˜Ÿใฏใฉใฎใ‚ˆใ†ใซ่ฆ‹ใˆใ‚‹ใงใ—ใ‚‡ใ†ใ‹ใ€‚ๅ…ˆๆœˆใพใงใฏใ€่ชฐใ‚‚็Ÿฅใ‚Šใพใ›ใ‚“ใงใ—ใŸใ€‚ๅœฐ็ƒใ‹ใ‚‰่ฆ‹ใ‚‹ใจใ€15ๅนดใ”ใจใซๅœŸๆ˜Ÿใฎ็’ฐใŒๅœฐ็ƒใฎๆ–นๅ‘ใ‚’ๅ‘ใใ€ๆถˆใˆใฆใ—ใพใ†ใ‚ˆใ†ใซ่ฆ‹ใˆใ‚‹ใฎใงใ™ใ€‚็’ฐใฎๆถˆๅคฑใฏใ‚‚ใฏใ‚„่ฌŽใงใฏใ‚ใ‚Šใพใ›ใ‚“ใ€‚ๅœŸๆ˜Ÿใฎ็’ฐใฏ้žๅธธใซ่–„ใใ€ๅœฐ็ƒใŒๅคช้™ฝใซ้žๅธธใซ่ฟ‘ใ„ใŸใ‚ใ€็’ฐใŒๅคช้™ฝใฎๆ–นๅ‘ใ‚’ๅ‘ใ„ใฆใ„ใ‚‹ใจใใฏใ€ๅœฐ็ƒใฎใปใผ็œŸๆจชใ‚’ๅ‘ใ„ใฆใ„ใ‚‹ใ‹ใ‚‰ใงใ™ใ€‚ๅนธใ„ใชใ“ใจใซใ€ใ“ใฎ็ฌฌไธ‰ๅƒๅนด็ด€ใซใŠใ„ใฆใ€ไบบ้กžใฏๆ˜ฅๅˆ†ใƒป็ง‹ๅˆ†ใซ็’ฐใ‚’ๆจชใ‹ใ‚‰่ฆ‹ใ‚‹ใ“ใจใŒใงใใ‚‹ใปใฉ้€ฒๆญฉใ—ใฆใ„ใพใ™ใ€‚ๅ…ˆๆœˆใ€ๅœŸๆ˜Ÿใ‚’ๅ‘จๅ›žใ™ใ‚‹ๆŽขๆŸปๆฉŸใ‚ซใƒƒใ‚ทใƒผใƒ‹ใฏใ€ๆ˜ฅๅˆ†ใƒป็ง‹ๅˆ†ใซๅœŸๆ˜Ÿใฎ็’ฐใฎๅ‰ไพ‹ใฎใชใ„ไธ€้€ฃใฎๅ†™็œŸใ‚’ๆ’ฎๅฝฑใ™ใ‚‹ใ“ใจใซๆˆๅŠŸใ—ใพใ—ใŸใ€‚ใใฎใ‚ˆใ†ใช75ๆžšใฎ็”ปๅƒใ‚’ใƒ‡ใ‚ธใ‚ฟใƒซๅˆๆˆใ—ใŸใ‚‚ใฎใŒไธŠใซๆŽฒ่ผ‰ใ•ใ‚Œใฆใ„ใพใ™ใ€‚็’ฐใฏ็•ฐๅธธใซๆš—ใ่ฆ‹ใˆใ€ๅœŸๆ˜Ÿใฎ้›ฒ้ ‚ใซใฏ้žๅธธใซ็ดฐใ„็’ฐใฎๅฝฑใฎ็ทšใŒ็ขบ่ชใงใใพใ™ใ€‚็’ฐ้ขใ‹ใ‚‰็ชใๅ‡บใŸ็‰ฉไฝ“ใฏๆ˜Žใ‚‹ใ็…งใ‚‰ใ•ใ‚Œใ€้•ทใ„ๅฝฑใ‚’่ฝใจใ—ใพใ™ใ€‚ใ“ใ‚Œใ‚‰ใฎ็”ปๅƒใ‚’่ชฟๆŸปใ™ใ‚‹ใ“ใจใงใ€ไบบ้กžใฏๅœŸๆ˜Ÿใฎ็’ฐใฎ็ฒ’ๅญใฎๅ…ทไฝ“็š„ใชๅคงใใ•ใ‚„่ปŒ้“้‹ๅ‹•ใฎไธ€่ˆฌ็š„ใชๅŠ›ๅญฆใ‚’็†่งฃใ™ใ‚‹ใฎใซๅฝน็ซ‹ใคใ‹ใ‚‚ใ—ใ‚Œใพใ›ใ‚“ใ€‚
ๅŽŸๆ–‡๏ผˆEnglish๏ผ‰
How would Saturn look if its ring plane pointed right at the Sun? Before last month, nobody knew. Every 15 years, as seen from Earth, Saturn's rings point toward the Earth and appear to disappear. The disappearing rings are no longer a mystery -- Saturn's rings are known to be so thin and the Earth is so near the Sun that when the rings point toward the Sun, they also point nearly edge-on at the Earth. Fortunately, in this third millennium, humanity is advanced enough to have a spacecraft that can see the rings during equinox from the side. Last month, that Saturn-orbiting spacecraft, Cassini, was able to snap a series of unprecedented pictures of Saturn's rings during equinox. A digital composite of 75 such images is shown above. The rings appear unusually dark, and a very thin ring shadow line can be made out on Saturn's cloud-tops. Objects sticking out of the ring plane are brightly illuminated and cast long shadows. Inspection of these images may help humanity understand the specific sizes of Saturn's ring particles and the general dynamics of orbital motion.

๏ผผ ใ“ใฎๆ„Ÿๅ‹•ใ‚’ๅฎ‡ๅฎ™ไปฒ้–“ใซใ‚ทใ‚งใ‚ข ๏ผ

ๅฎ‡ๅฎ™ใ‚’Xใงใ‚ทใ‚งใ‚ข
ยฉ NASA / APOD