๐Ÿš€ ๅฎ‡ๅฎ™ใฎ่จ˜ๆ†ถใƒปใ‚ซใƒฌใƒณใƒ€ใƒผๆคœ็ดข
ใใ‚‡ใ† ใƒฉใƒณใƒ€ใƒ 
ๆ˜ฅๅˆ†็‚นใซใŠใ‘ใ‚‹ๅœŸๆ˜Ÿ Saturn at Equinox
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ๅœŸๆ˜Ÿใฎ็’ฐ้ขใŒๅคช้™ฝใซๆญฃๅฏพใ—ใŸใ‚‰ใ€ๅœŸๆ˜Ÿใฏใฉใฎใ‚ˆใ†ใซ่ฆ‹ใˆใ‚‹ใ ใ‚ใ†ใ‹๏ผŸๅ…ˆๆœˆใพใงใฏ่ชฐใ‚‚็Ÿฅใ‚‰ใชใ‹ใฃใŸใ€‚ๅœฐ็ƒใ‹ใ‚‰่ฆ‹ใ‚‹ใจใ€15ๅนดใ”ใจใซๅœŸๆ˜Ÿใฎ็’ฐใฏๅœฐ็ƒใฎๆ–นใ‚’ๅ‘ใใ€ๆถˆใˆใŸใ‚ˆใ†ใซ่ฆ‹ใˆใ‚‹ใ€‚็’ฐใŒๆถˆใˆใ‚‹ใฎใฏใ‚‚ใฏใ‚„่ฌŽใงใฏใชใ„ใ€‚ๅœŸๆ˜Ÿใฎ็’ฐใฏ้žๅธธใซ่–„ใใ€ๅœฐ็ƒใฏๅคช้™ฝใซ้žๅธธใซ่ฟ‘ใ„ใŸใ‚ใ€็’ฐใŒๅคช้™ฝใฎๆ–นใ‚’ๅ‘ใใจใ€ๅœฐ็ƒใซๅฏพใ—ใฆใปใผ็œŸๆจชใ‚’ๅ‘ใใ“ใจใซใชใ‚‹ใ€‚ๅนธใ„ใชใ“ใจใซใ€ใ“ใฎ3ๅƒๅนด็ด€ใซใŠใ„ใฆใ€ไบบ้กžใฏๆ˜ฅๅˆ†็‚นใฎ็’ฐใ‚’ๆจชใ‹ใ‚‰่ฆ‹ใ‚‹ใ“ใจใŒใงใใ‚‹ๅฎ‡ๅฎ™่ˆนใ‚’ๆŒใคใปใฉ้€ฒๆญฉใ—ใŸใ€‚ๅ…ˆๆœˆใ€ๅœŸๆ˜Ÿใ‚’ๅ‘จๅ›žใ™ใ‚‹ๅฎ‡ๅฎ™่ˆนใ‚ซใƒƒใ‚ทใƒผใƒ‹ใฏใ€ๆ˜ฅๅˆ†็‚นใฎๅœŸๆ˜Ÿใฎ็’ฐใฎใ“ใ‚Œใพใงใซใชใ„ไธ€้€ฃใฎๅ†™็œŸใ‚’ๆ’ฎๅฝฑใ™ใ‚‹ใ“ใจใซๆˆๅŠŸใ—ใŸใ€‚ใใฎใ‚ˆใ†ใช75ๆžšใฎ็”ปๅƒใ‚’ใƒ‡ใ‚ธใ‚ฟใƒซๅˆๆˆใ—ใŸใ‚‚ใฎใŒไธŠใซ็คบใ•ใ‚Œใฆใ„ใ‚‹ใ€‚็’ฐใฏ็•ฐๅธธใซๆš—ใ่ฆ‹ใˆใ€ๅœŸๆ˜Ÿใฎ้›ฒ้ ‚ใซ้žๅธธใซ็ดฐใ„็’ฐใฎๅฝฑใฎ็ทšใŒ่ฆ‹ใˆใ‚‹ใ€‚็’ฐ้ขใ‹ใ‚‰็ชใๅ‡บใฆใ„ใ‚‹็‰ฉไฝ“ใฏๆ˜Žใ‚‹ใ็…งใ‚‰ใ•ใ‚Œใ€้•ทใ„ๅฝฑใ‚’่ฝใจใ—ใฆใ„ใ‚‹ใ€‚ใ“ใ‚Œใ‚‰ใฎ็”ปๅƒใ‚’ๅˆ†ๆžใ™ใ‚‹ใ“ใจใงใ€ไบบ้กžใฏๅœŸๆ˜Ÿใฎ็’ฐใ‚’ๆง‹ๆˆใ™ใ‚‹็ฒ’ๅญใฎๅ…ทไฝ“็š„ใชๅคงใใ•ใ‚„ใ€่ปŒ้“้‹ๅ‹•ใฎไธ€่ˆฌ็š„ใชๅŠ›ๅญฆใ‚’็†่งฃใ™ใ‚‹ใฎใซๅฝน็ซ‹ใคๅฏ่ƒฝๆ€งใŒใ‚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