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NOTES: MERCURY Mariner 10 in 1973 mapped 60% of Surface. D = 1.4 D(moon) = .35 D(earth) No axial tilt Day = 176 earth

NOTES: MERCURY Mariner 10 in 1973 mapped 60% of Surface. D = 1.4 D(moon) = .35 D(earth) No axial tilt Day = 176 earth days = twice orbital period Rocky mantle Same density as earth implying large metallic core,

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NOTES: MERCURY Mariner 10 in 1973 mapped 60% of Surface. D = 1.4 D(moon) = .35 D(earth) No axial tilt Day = 176 earth

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  1. NOTES: MERCURY • Mariner 10 in 1973 mapped 60% of Surface. • D = 1.4 D(moon) = .35 D(earth) • No axial tilt • Day = 176 earth days = twice orbital period • Rocky mantle Same density as earth implying large metallic core, • solid because it is a small planet. Cut down by a large impact or early solar bombardment. • 2. Extremely thin atmosphere of helium, sodium, and potassium continually • escaping into space. Temps: 425K to 100K (-170C). • Rotates 3 times for every 2 revolutions--same side • faces sun at alternate perehelia (semiperiodic tidal locking). • Features: craters and basins filled with lava (like moon) and scarps • formed as planet cooled. Core was once liquid. • 5. A stronger magnetic field than expected, considering slow rotation and cool core. • A distorted magnetosphere. • 6. Same sequence and timing of formation of moon and mercury. No plate techtonics. • 7. Large impact crater--Caloris Basin (like Orientale Basin on moon) • --jumbled hills on opposite side of planet.

  2. Mercury looks like the Moon

  3. Mariner 10 in 1973 mapped 60% of Surface. Messenger flybys (2010, filled out that map to 97%). Messenger set to orbit in 2011. D = 1.4 D(moon) = .35 D(earth), No axial tilt Day = 176 earth days = twice orbital period

  4. Rocky mantle. Mass determination and size implies large metallic core, solid because it is a small planet. Mantle cut down by a large impact or early solar bombardment.

  5. Extremely thin atmosphere of helium, sodium, and potassium continually escaping into space. Temps: 425K to 100K (-170C).

  6. Rotates 3 times for every 2 revolutions--same side faces sun at alternate perehelia (semiperiodic tidal locking).

  7. Features: craters and basins filled with lava (like moon) and scarps (cliffs) formed as planet cooled.

  8. Unexpected magnetic field, considering slow rotation and solid, cool core. A distorted magnetosphere. Core may be a permanent magnet.

  9. Large impact crater--Caloris Basin (like Orientale Basin on moon) --jumbled hills on opposite side of planetary body.

  10. Mercury: up close and personal Same sequence and timing of formation of moon and mercury. No plate techtonics

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