ASTR 001 Lecture 21: Astr 1 - Lecture 21
15 Jul 2020
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Document Summary
Contrary to our perception, we are not sitting still . We are moving with the earth in several ways and at high speeds. The spins (or rotates) around its axis once every day (except north and south poles) Earth orbits the sun (revolves) once every year. Ecliptic plane plane that the earth is moving on around the sun. 100,000 km/hr plane that sun is on as we see it on earth. Earth"s rotation axis is tilted by 23 degrees on the ecliptic plane. Motion of our solar system in the milky way galaxy. Some of our sun (and earth) relative to other stars in the solar neighborhood. Dominant motion: orbit motion around the center of the galaxy. Motion of milky way galaxy through universe. Some motion of our galaxy relative to nearby galaxies in local group . Hubble discovered that all galaxies outside our.
