Astronomy

• “Iron Dwarf” for having a large iron core and being only 38% the size of Earth


  Mercury
• Composition: Iron Core, Silicate Surface

  (Iron core is about the size of Earth’s moon)

  Mercury
• Hundreds of craters


  Mercury
• Second planet from the Sun

  Venus
• “Sister Planet” roughly the same size and mass as Earth’s

  Venus
• Clouds made of sulfuric acid


  Venus
• Lots of volcanic features, but not active.


  Venus
• Third planet from the Sun


  Earth
• 78% Nitrogen, 21% Oxygen, 1% argon


  Earth
• One moon

  Earth
• Eighth planet from the Sun


  Neptune
• “Blue Colossus”

  Five main rings


  Neptune
• Atmosphere: 79% Hydrogen, 18% Helium and 3% Methane


  Neptune
• Dynamic atmosphere with a main clouds of methane ice crystals.

  Neptune
• Composition: Hydrogen and other elements mixed into an icy liquid (outer mantle), slushy mixture rich in water, methane, and ammonia (inner mantle), and an icy & rocky (core)

  Neptune
• Orbit is almost perfectly circular

  Neptune
• Axial inclination of 97.8° (sideways compared to other planets)

  Neptune
• Little is known, but best guess is that 70% of the planet is rock and ice makes up the other 30% of the planet.

  Pluto
• 67% of the diameter of the moon.

  Elongated and inclined orbit different than the other planets


  Pluto
• Belt of icy planet building leftovers

  Kuiper belt