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  1. 1. 1. ______ is a battered worldplanet.
  2. 2. Mercury- is the first planet in the solar system, only about 60 million km away fromthe sun.- it takes Mercury about 88days to go round the sun ones and one Mercury day isabout 58 Earth days long. The Surface of mercury is very much like that of the moon.Mercury is a heavy planet. Gravity is about one third of the earth’s. the core ofMercury is probably still liquid. Mercury Moon
  3. 3. GASES FOUND IN MERCURY’S ATMOSPHERE:Mercury’s thin atmosphere contains hydrogen, helium andoxygen. It also has smaller amount of sodium, potassium,calcium and magnesium. 2. What are the three abundant gases found in Mercury’s atmosphere?
  4. 4. How can there be water on a planet that nearlyboils in the solar wind? NASA scientist Thomas Zurburchen notesthree possibilities: first, there may be reservoirs of water ice insmall areas of Mercury’s poles (this water couldbe as old as the solar system). Next, cometsmay have deposited. Third , chemical sputteringcould create water from the solar wind andMercurian rock .
  5. 5. Because of it’s close proximity to the Sun, the innermost planet Mercury cannot be studied from Earth against the night dark sky; many astronomers and most people have never seen the elusive planet.During the daytime, Mercury’s ground temperature reaches a blistering 740 degrees kelvin ; at night time it plunges to a freezing 100 degrees kelvin. Mercury has a thin atmosphere to speak of; just an exceedingly tenuous wisp of atoms varies in location and time and must be continually does the 3.How many degrees kelvin dislodged from it’s Mercury’s temperature blistered? atmosphere.
  6. 6.  Mercury’s rotation axis is aligned perpendicular to it’s orbital plane, So there are no seasons on the planet, and radar bright spots suggest that water ice may reside in permanently shaded regions near it’s poles. Although one of Earth’s nearest neighbors, only one spacecraft, Mariner 10, has ventured near Mercury, viewing only about half of the planet’s surface; the details of the other side of Mercury have never been seen. At first glance, Mercury’s airless, cratered surface resembles the Moon, but Mercury has unique surface features, including ancient inter-crater plains, young smooth plains. Relative to it’s size, Mercury has the biggest iron core of
  8. 8. ******
  9. 9. Exosphere mercury has an extremely tenuous atmospherewith a surface pressure a trillion times less thanEarth’s. this type of tenuous atmosphere is called anexosphere because atoms in it rarely collide. Marinerten identified the presence of hydrogen, helium andoxygen in the atmosphere and set upper limits on theabundance of argon. These elements are probablyderive from the solar wind. Later Earth-basedtelescopic observation detected sodium andpotassium in quantities greater than the elementspreviously known. sodium and potassium could be released from surface rocks by theirinteraction with solar radiation or by impactvaporization of micrometeoroid material. 4.This type of tenuous atmosphere is day – to both sodium and potassium show called______________?–day changes in their global distribution .
  10. 10. 5.What are the two abilities of a planet toretain an atmosphere?
  11. 11. CaloriesRim Crest Basin ~1,300 km in diameter
  12. 12. Effects of theformation of the Calories Basin
  13. 13. Linear cliffs called scarps hundreds of km long wereprobably caused by contraction and wrinkling duringcooling of the planet6.Linear cliffs called ____ hundreds of kmlong were probably caused by contractionand wrinkling during cooling of planet.
  14. 14. Physical properties ofMercury
  15. 15. Orbit mercury has a very elliptical ( oval- shaped ) orbit. At perihelion (atits closest point) it is about 46 million km (28.58 million miles) fromthe sun, but at aphelion (at its farthest point) it is 70 million km.mercury is about 77.3 million km ( 48 million miles) from earth at itscloses approached.Rotation the planet rotates once about every 59 earth days, rotation slowerthan that of any other planet except Venus . As a result of planet’sslow rotation on its axis and rapid movement around the sun, a day onmercury lasts 176 earth days (interval between one sunrise and thenext). 7.How far is the mercury from the sun?
  16. 16. Composition mercury is the 2nd densest major body in the solar system afterplanet earth and its density slightly less than the Earths. Mercury’ssmaller mass makes its force of gravity only about a third as strong asthat of the Earth.Surface the surface of mercury consists of cratered terrain and smith plainsand many deep craters similar to those on the moon. 7.A second densest major body in The solar system?
  17. 17. Scans of mercury made by earth- basedradar indicate that craters at mercurys polescontain water ice. the floors of the craters are permanentlyshielded from sunlight, so the temperaturenever gets high enough to melt the ice.
  18. 18. Temperature mercury is a planet of extreme variations. It ishatter on Venus, with less fluctuations. Thetemperature on the planet may reach 450 degreesC (840 degrees F) during the day .but at night , the temperature may as low as -170degrees C (-275 degrees F)
  19. 19. Atmosphere Mercury is dry. Extremely hot and almost airless.Planet mercury is too small for its gravity to retain anysignificant atmosphere over long periods of time. the weak atmosphere contains hydrogen, helium,oxygen, sodium, calcium, and potassium. 8-10. Mercury is?
  20. 20. End