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      Результаты олимпиады   06/05/2019

      Внимание участники!  Уже известны результаты первой онлайн-олимпиады от нашего сообщества. Прикрепляю файл с результатами внизу Результаты олимпиады по географии - Лист1.pdf 
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Mercury quick summary

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ÐаÑÑинки по запÑоÑÑ mercury

Mercury - the smallest and innermost planet in the Solar System

  1. Orbital period: 88 days
  2. Mercurian day: 58 days 15 hours
    • Orbital period/duration of the day = spin-orbit resonance. For Mercury, it is 3/2. When spin-orbit resonance equals to 1, one side of the planet will always be facing the sun, and another side will always be in the dark (like with Earth and Moon). This effect is called tidal locking. Because 3/2 is close to 1 and for some other technical reasons people thought that Mercury rotates synchronically with the Sun. This is not true.
    • On the other hand, 3/2 is indeed close to 1, therefore, Mercury rotates even slower relative to the sun. That means that if you could stand on the surface of Mercury, it would take a staggering 176 Earth days for the Sun to rise, set and rise again to the same place in the sky just once!
  3. Temperature range: from -190 (night side) to +430 C (sunny side)
  4. Has a big iron core that creates weak Magnetic Field, and contains 83% of the planet's mass & 55% of the volume
  5. The orbit is the most eccentrical (circle-like) compared to other planets in the solar system.
  6. No atmosphere. It is blown away by the solar wind.
  7. No satellites
  8. Composition: 70% metallic, 30% silicate
  9. Due to its massive core, has the second density in the solar system (5.427 g/cm3). On the first place is the Earth (5.515 g/cm3)
  10. Surface shows heavy cratering and mare-like plains (mare is the name for basaltic plains on Moon. It is the sign of ancient volcanic eruptions)
  11. Mercury seems to be geologically inactive for already billions of years.

 

Definetely check out Nasa's overview of Mercury and other planets: https://solarsystem.nasa.gov/planets/mercury/overview/

Other useful links:

https://airandspace.si.edu/exhibitions/exploring-the-planets/online/solar-system/mercury/surface.cfm

https://en.wikipedia.org/wiki/Tidal_locking

https://www.universetoday.com/47834/length-of-day-on-mercury/

https://en.wikipedia.org/wiki/Lunar_mare

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