Astronomy 1021 Lecture Notes - Lecture 8: Galilean Moons, 25143 Itokawa, Axial Tilt
4 Oct 2018
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Document Summary
Most massive black hole known in the universe. All three techniques used in study of solar system; Telescopes: can measure the angular diameter of planets. With distance (from previous slide) and angular size we can know the actual size of planets. Take a long time to build, launch, travel. A flyby spacecraft mission comes close to a planet just once. Cheaper than parking a spacecraft in orbit but do not get as much data. Electric power and propellant will then run out. More time to gather data but cannot obtain detailed information about world"s surface. Not only land on the surface of another world but bring back samples. Moon (automated and human missions- first but apollo 11) Solar system: sun and a tiny bit of stuff . Sun is the size of a large grapefruit (14 cm) Earth is the size of a ball point, 15 meters away. Solar system is almost entirely made of nearly empty space.
