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What are the ultimate figures of moons in our solar system?
šWith just 12.4 km (7.7 miles) in diameter, Marsā moon Deimos is one of the smallest known moons in our solar system.
šWith a diameter of 5,267 km (3,273 miles), Jupiterās moon Ganymede is the largest moon in our solar system.
šSaturn has the most number of moons: 82 moons orbit the ringed planet.
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What is a moon and its main criteria?
We have already specified the main features of a star and a planet, letās now also clarify what a moon is.
It would be incorrect to limit the definition of a š as any celestial object that revolves around a planet, because that would mean dust particles also fall under that category.
According to the International Astronomical Union (IAU), to be called a moon, a celestial body must satisfy the following 3ļøā£ criteria:
ā
It must be in a heliocentric orbit (it must revolve around its planet, and together they both must revolve around the Sun).
ā
It should be roughly spherical in shape, but smaller than the planets (if its size is comparable to its host planet, then it would be a planet by itself, not a moon). Exception: captured asteroids donāt satisfy this criterion.
ā
It has to be massive enough to clear most of its orbit of debris so that it is the only dominant celestial body in its orbit.
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How does an occultation look like?
Enjoy a fascinating video that shows the occultation of Saturn by the Moon.š¤©
15 years ago, in May 2007, using a ground-based telescope, an amateur astronomer Jan Koet had a chance to film the occultation of the second largest planet in the solar system by the Moon.
The author of the timelapse explains that he made alterations to accentuate the luminosity of Saturn.
The sequence is twice as fast as in reality.
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Saturn Moon occultation.mp41.55 MB
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How many moons have been discovered in our solar system?
In our system almost all major planets and even dwarf planets have moons.
Many are naturally born from the leftover gas and dust from the planetās formation. Few others belonged to the Kuiper Belt and is believed to have been captured by gas giants.
Among the wide variety of celestial objects found in our solar system, we have 2ļøā£1ļøā£0ļøā£ moons of varying sizes, shapes, and properties:
Earth 1ļøā£ moon
Mars 2ļøā£ moons
Jupiter 7ļøā£9ļøā£ moons
Saturn 8ļøā£2ļøā£ moons
Uranus 2ļøā£7ļøā£ moons
Neptune 1ļøā£4ļøā£ moons
Pluto 5ļøā£ moons
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How many solar or lunar eclipses occur in one calendar year?
The answer very much depends on the year.
One calendar year has a minimum of 4ļøā£ eclipses ā 2ļøā£ solar eclipses and 2ļøā£ lunar eclipses.
Most years ā such as 2022 ā have only 4ļøā£ eclipses, although there are years with 5ļøā£ eclipses (2013, 2018 and 2019), or 6ļøā£ eclipses (2011 and 2020).
āļøIt is very rare to have 7ļøā£ eclipses in one calendar year. The last time it happened was in 1982 and the next time will be 2038.
Any calendar year presenting the maximum of 7ļøā£ eclipses must have the first eclipse coming in early January, in order to leave enough room for the seventh eclipse to take place in late December. Then the middle part of the year has to stage three eclipses within a single lunar month ā the period of time between successive new moons or full moons with a mean duration of 29.53059 days.
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What are the eclipses and occultations?
āļøAn occultation is a complete obscuration of the light of an astronomical body, most commonly a star, by another astronomical body, such as a planet or a satellite, without any interaction between the bodies involved. This is purely apparent and related to the observer. Hence, a total solar eclipse is the occultation of the Sunāļø by the Moonš.
āļøAn eclipse is the result of the total or partial masking of a celestial body by another along observersā line of sight and regardless of their position.
Solar eclipses result from the š blocking the āļø relative to the š; thus š, š and āļø all lie in one line.
Lunar eclipses work the same way in a different order: š, š and āļø all in one line, the Earthās shadow hiding the Moon from view.
This phenomenon is visible to any observer of the Moon, regardless of its position on the surface of the Earth or in space.
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