front 1 Autumnal equinox | back 1 September 22-23 |
front 2 winter solstice | back 2 december 21-22 |
front 3 summer solstice | back 3 june 20-27 |
front 4 spring equinox | back 4 march 20-21 |
front 5 axis | back 5 an invisible line between the north pole and the south pole. It is tilted. |
front 6 where does the sun rise and set | back 6 the sun rises in the east, moves across the sky, and sets in the west. |
front 7 right angle | back 7 neep tide |
front 8 strait line | back 8 spring tide |
front 9 planets in order of the sun | back 9 1.) mercury 2.) Venus 3.) earth 4.) Mars 5.) jupiter 6.) saturn 7.) uranus 8.) Neptune |
front 10 how many times do neep tides and spring tides occur each month | back 10 two times |
front 11 solar system consists of | back 11 - stars - planets - moons - asteriods -meteors - comets |
front 12 (AU) | back 12 Astronomical unit |
front 13 when was Pluto reclassified | back 13 2006 |
front 14 what are satellites | back 14 moons |
front 15 loose balls of ice and rock with long, narrow orbits | back 15 comets |
front 16 small rocky objects, often found between jupiter and mars | back 16 asteroids |
front 17 luminous spheroid of plasma held together by self-gravity | back 17 star |
front 18 geocentric model | back 18 earth is the center and all planets revolve around it. |
front 19 Heliocentric model | back 19 the sun is the center and all the planets orbit around it |
front 20 100-170 AD | back 20 Ptolemy further developed the geocentric model, his model was accepted for almost 1500 years |
front 21 Geo means what in greek | back 21 earth |
front 22 helio means what in greek | back 22 sun |
front 23 310-230 BC | back 23 Aristarchus first developed the Heliocentric model. His model was not widely accepted for many years. |
front 24 1543 | back 24 Nicolaus Copernicus further developed the Heliocentric Model, even with his researched theory, many people needed more evidence. |
front 25 late 1500s | back 25 Tycho Brahe and Johannes Kelper discovered that the planets orbited in a ellipse |
front 26 meaning of ellipse | back 26 an oval shape |
front 27 1610 Galileo Galilei | back 27 Galileo used a telescope to discover 4 moons around Jupiter. this proved that not everything revolved around the earth. this led to other discoveries that helped prove that the planets revolve around the sun. |