@Regran_ed from @nasahubble - This #HubbleClassic was released in 2004:
At first glance, Jupiter looks like it has a mild case of the measles. Five spots - one colored white, one blue, and three black - are scattered across the upper half of the planet. Closer inspection by Hubble reveals that these spots are actually a rare alignment of three of Jupiter's largest moons - Io, Ganymede, and Callisto - across the planet's face. The telltale signatures of this alignment are the shadows [the three black circles] cast by the moons.
On Earth, we witness a solar eclipse when our Moon's shadow sweeps across our planet's face as it passes in front of our Sun. Jupiter, however, has four moons roughly the same size as Earth's Moon. The shadows of three of them occasionally sweep simultaneously across Jupiter.
Seeing three shadows on Jupiter happens only about once or twice a decade. Why is this triple eclipse so unique? Io, Ganymede, and Callisto orbit Jupiter at different rates. Their shadows likewise cross Jupiter's face at different rates. For example, the outermost moon Callisto orbits the slowest of the three satellites. Callisto's shadow moves across the planet once for every 20 shadow crossings of Io. Add the crossing rate of Ganymede's shadow and the possibility of a triple eclipse becomes even more rare. Viewing the triple shadows in 2004 was even more special, because two of the moons were crossing Jupiter's face at the same time as the three shadows.
For more information:
Credit: NASA, ESA, and E. Karkoschka (University of Arizona)
#NASA#Hubble#space#science#astronomy#universe#telescope#cosmos#Jupiter#moons#planet#eclipse - #regrann
Environmental activist blockaded the UK's energy department in London today by lying chained together, with some glued to the building to prevent entry. 22 have been arrested due to this blockade. This group of protesters are fighting to keep global temperatures under a 2C danger threshold. They compare themselves to the suffragettes and hoping they will be taken seriously as they are willing to go to jail for their actions. These people are trying to protect us all just like I know a lot of people on the small scale are trying to do, they don't deserve to be arrested for trying to protecting our planet do they? 💚
Bir dakika dahi ara vermeyen siddetli yagmurla gezdik Venedik'i... Kaybolmadan gezmenin imkansiz oldugunu duymustuk ama baslangicta bunu astigimizi düsündük🙈 ta ki kayboldugumuzu anlayana kadar... Burada kaybolmamak imkansiz ! Navigasyon ve haritalari etkisiz birakan daracik sokaklari var çünkü. Kalabaligina, yagmuruna, asiri turistik olmasina ve fahis fiyatlarina ragmen mutlaka görülmesi gereken yerlerden biri. An geliyor yanlis girdiginiz bir sokak hayatinizda gördügünüz en tatli sokak olabiliyor✨