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Using a new telescope astronomer William Herschel discovered the Saturnian moon Enceladus OTD in 1789. Named after the giant Enceladus of Greek mythology, for nearly 200 years little more was learned until the fly-by missions of Voyager 1 & 2 and more recently from Cassini.
https://twitter.com/aisoffice/status/1696064303625838849
le 19 septembre 1848, il y a donc exactement 175 ans, les astronomes américains William C. Bond (1789-1859) et son fils George P. Bond (1825-1865) découvrent Hyperion - découvert également et indépendamment 2 jours plus tard par l'anglais William Lassell (1799-1880)
https://twitter.com/spacemen1969/status/1704018986529386749
#OTD 23 September 1846, #Neptune was observed by German astronomer Johann Gottfried Galle, confirming Urbain Jean Joseph Le Verrier's mathematical prediction of the planet's existence. Neptune had been observed many times in the past but not recognised 👉https://en.wikipedia.org/wiki/Discovery_of_Neptune
https://twitter.com/ESA_History/status/1705535730787778600
#OTD in 1846, Neptune's largest moon Triton was discovered. It is the only large moon in our solar system that orbits in the opposite direction of its planet's rotation. Learn more: https://science.nasa.gov/neptune/moons/triton/This photo of Triton was taken by Voyager 2 in 1989.
On this day in 1977, small solar system body Chiron was discovered by Charles Kowal. Chiron is currently classified as both a minor planet and a comet and scientists believe that it could have rings (as shown in this artist rendering). More stats: https://s.si.edu/47jeb9D
Today in 1801, Giuseppe Piazzi discovered dwarf planet Ceres, the largest object in the asteroid belt between Mars and Jupiter. It was visited by the Dawn spacecraft in 2015, the first dwarf planet to receive a visit from a spacecraft.
🥳 Happy New Year, Mars! 📅 At 10:32 CET/09:32 UTC, the Red Planet begins another orbit around the Sun. It's year 38 on Mars.🔴🔁🌍 A year on Mars vs Earth https://esa.int/Science_Exploration/Human_and_Robotic_Exploration/Happy_New_Year_on_Mars/
What's your martian New Year’s resolution? 🤔As Mars begins Year 38 today, we asked @esa teams about their mission goals for future Mars exploration.Here’s what they shared: https://blogs.esa.int/to-mars-and-back/2024/11/11/new-years-resolutions-for-mars/
Marking Mars' New Year with poetry.Dutch author Marjolijn van Heemstra shares her new poem about the Red Planet.https://blogs.esa.int/to-mars-and-back/2024/11/12/a-poem-for-mars/
Martian scientists ring in Year 38 on Mars! 🥳They are meeting in Paris to discuss the exciting new science coming from @esa's Mars Express and @ESA_TGO orbiters circling the Red Planet. 🔴
Brian_Henderson @brian_hendersonA NEW YEAR on MARS!! 🥳🎊🧧🎍The convention for Earthlings to count years in the martian calendar started in 1955 (Earth reference). So 68 Earth years later; Mars is entering Year 38! A Mars year has 687 Earth days.BTW: a day on Mars (sol) is 24.65 Earth hours. (+39 min)
#OTD 7 December 1676, first known report of presentation by Danish astronomer Ole Rømer on making the first successful measurement of the speed of light, based on observations of eclipses of moons of Jupiter.
ESA history @ESA_History 10:11 AM · Jan 5, 2023#OTD 5 January 1892, the first successful photograph of an #aurora was taken by German physicist Martin Brendel in Bossekop, Alta (Pic Alta Museum, Norway) @esascience @ESA_de 👉 https://altamuseum.no/en/altas-nyere-tids-historie/altas-historie/nordlys-1/nordlys
Wątek: Solar System (Przeczytany 2037 razy)