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Name: ___________________________ Block: __________ Science 9 – Ch.12 the Solar System 12.4 – A Closer look at the planets The Sun and most of the planets have a magnetic field that extends into space. Terrestrial (Inner) Planets High densities, slow rotations, solid metal cores (usually iron), solid surfaces, no rings. 1. _________________ Planet ____________________ to the Sun. Day time temperature: ________ degrees Night time: ________degrees Not visible in the night sky but visible just before sunrise and after sunset. ____________________________ revolution speed. The ___________ (dimples) on the surface are caused by the collision of the rocks and meteorites. will be seen passing in front of the sun (__________) in 2016 2. ___________________ Atmosphere consists of mainly ________ ______________________on the surface __________________ object you can see in the sky Earth and Venus have __________________________they both have similar sizes, composition, distance to the Sun. Unlike Earth Venus has ______ ocean and rotates in __________________ direction. next transit will be June 6, 2012 3. _______________ Contains mostly ___________________________ Earth has a wide variation of temperature between the poles and the equator, range from about ____________________________ About __________ of Earth’s surface is covered by ______________ (oceans, rivers, lakes, snow, ice) 4. ________________ Also called as “______________________” because of its reddish soil, the surface temperature from ______________ Dry and barren planet but there is evidence that Mars had volcanoes, glaciers and floods of water. Scientists believed that life may have existed on Mars. Gas Giants (Outer) Planets: Low densities, mainly hydrogen and helium gases, much bigger than terrestrial planets. 1. ___________________ ____________ planet in the solar system Has ___________moons Famous for its _________________bands 2. ____________________ ______________________planet in the solar system Has ___________________________ rings Has ___________ moons 3. _________________ Mainly ___________ gas_____________________________________ It’s diameter __________________________ but almost invisible to Earth because Uranus is so far away Spins on its ________, rotates in the ____________direction as Earth 4. ___________________ Some thin rings Has ________________________________ Has 13 moons Other objects in the Solar System: 1. ____________________ Was once considered as a planet _______________________ the distance of Uranus from the Sun Made up of ______________________________ similar to a comet Has 2 moons Distances in the Solar System: The Kuiper Belt is _________________ collection of thousands of small, icy bodies The distances to the planets and other objects in our solar system are __________, so it is convenient to use astronomical units, instead of kilometres, when referring to these distances. An ______________________ (AU) The Earth is not always the same distance from the Sun. An AU is equal to __________________ km. It takes ____________ for light to travel from the Sun to the Earth,traveling at the speed of light, of course. The Moon, the closest solar system body to us, is about ____________ away from the Earth, which means it takes about _____________ for radio signal from Earth to reach the Moon and travel back To memorize the order of the planets: Michael very eagerly made a jelly sandwich under no protest (Mercury, Venus, Earth, Mars, Asteroid Belt, Jupiter, Saturn, Uranus, Neptune, Pluto) HW: CYU pg. 394 Q 1, 3, 9, 17, 18, 19; Quiz 12.3 – 12.4 next class