ๆฅๅ็นใฎๅๆ
Saturn at Equinox
ๅๆใฎ็ฐ้ขใๅคช้ฝใฎ็ไธใๅใใฆใใใใๅๆใฏใฉใฎใใใซ่ฆใใใงใใใใใๅ
ๆใพใงใฏใ่ชฐใ็ฅใใพใใใงใใใๅฐ็ใใ่ฆใใจใ15ๅนดใใจใซๅๆใฎ็ฐใๅฐ็ใฎๆนๅใๅใใๆถใใฆใใพใใใใซ่ฆใใใฎใงใใ็ฐใฎๆถๅคฑใฏใใฏใ่ฌใงใฏใใใพใใใๅๆใฎ็ฐใฏ้ๅธธใซ่ใใๅฐ็ใๅคช้ฝใซ้ๅธธใซ่ฟใใใใ็ฐใๅคช้ฝใฎๆนๅใๅใใฆใใใจใใฏใๅฐ็ใฎใปใผ็ๆจชใๅใใฆใใใใใงใใๅนธใใชใใจใซใใใฎ็ฌฌไธๅๅนด็ดใซใใใฆใไบบ้กใฏๆฅๅใป็งๅใซ็ฐใๆจชใใ่ฆใใใจใใงใใใปใฉ้ฒๆญฉใใฆใใพใใๅ
ๆใๅๆใๅจๅใใๆขๆปๆฉใซใใทใผใใฏใๆฅๅใป็งๅใซๅๆใฎ็ฐใฎๅไพใฎใชใไธ้ฃใฎๅ็ใๆฎๅฝฑใใใใจใซๆๅใใพใใใใใฎใใใช75ๆใฎ็ปๅใใใธใฟใซๅๆใใใใฎใไธใซๆฒ่ผใใใฆใใพใใ็ฐใฏ็ฐๅธธใซๆใ่ฆใใๅๆใฎ้ฒ้ ใซใฏ้ๅธธใซ็ดฐใ็ฐใฎๅฝฑใฎ็ทใ็ขบ่ชใงใใพใใ็ฐ้ขใใ็ชใๅบใ็ฉไฝใฏๆใใ็
งใใใใ้ทใๅฝฑใ่ฝใจใใพใใใใใใฎ็ปๅใ่ชฟๆปใใใใจใงใไบบ้กใฏๅๆใฎ็ฐใฎ็ฒๅญใฎๅ
ทไฝ็ใชๅคงใใใ่ป้้ๅใฎไธ่ฌ็ใชๅๅญฆใ็่งฃใใใฎใซๅฝน็ซใคใใใใใพใใใ
ๅๆ๏ผEnglish๏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 ใใฎๆๅใๅฎๅฎไปฒ้ใซใทใงใข ๏ผ
ๅฎๅฎใXใงใทใงใข
ยฉ NASA / APOD