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Planet Nine is a hypothetical ninth planet in the outer region of the Solar System. [2] [4] Its gravitational effects could explain the peculiar clustering of orbits for a group of extreme trans-Neptunian objects (ETNOs), bodies beyond Neptune that orbit the Sun at distances averaging more than 250 times that of the Earth i.e. over 250 astronomical units (AU).
The Persephone ribbon controller is also able to record pressure or velocity. The ribbon is a linear potentiometer that generates different control voltages depending on where it is touched. Thus, the modern ribbon on the Persephone replaces the nickel-chrome resistance wire used as a variable resistor to control the pitch of the trautonium 1.
399 Persephone is a main belt asteroid. It was discovered by German astronomer Max Wolf on 23 February 1895 in Heidelberg. [4] References
Schematic diagram of the orbits of the fictional planets Vulcan, Counter-Earth, and Phaëton in relation to the five innermost planets of the Solar System.. Fictional planets of the Solar System have been depicted since the 1700s—often but not always corresponding to hypothetical planets that have at one point or another been seriously proposed by real-world astronomers, though commonly ...
Hubble's sharpest view of Mars: Although the ACS “Fastie finger” intrudes, it achieved a spatial scale of 5 miles, or 8 kilometres per pixel at full resolution. The history of Mars observation is about the recorded history of observation of the planet Mars.
Persephone and Dionysos. Roman copy after a Greek original of the 4th–3rd century B.C. Marble. Hermitage.. In ancient Greek mythology and religion, Persephone (/ p ər ˈ s ɛ f ə n iː / pər-SEF-ə-nee; Greek: Περσεφόνη, romanized: Persephónē, classical pronunciation: [per.se.pʰó.nɛː]), also called Kore (/ ˈ k ɔːr iː / KOR-ee; Greek: Κόρη, romanized: Kórē, lit.
It is known that in the past, Mars has had a much more circular orbit. At one point, 1.35 million Earth years ago, Mars had an eccentricity of roughly 0.002, much less than that of Earth today. [188] Mars's cycle of eccentricity is 96,000 Earth years compared to Earth's cycle of 100,000 years. [189]
Many areas of Mars change their shape and/or coloration. For many years, astronomers observing regular changes on Mars when the seasons changed, thought that what they saw was evidence of vegetation growing. After close-up inspection with a number of spacecraft, other causes were discovered.