the universe around us geocentric = earth-centered egocentric = self-centered read huygens quote (c....
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![Page 1: The Universe Around Us Geocentric = Earth-centered Egocentric = Self-centered Read Huygens quote (c. 1690) on page 3 Is there a center to the Universe?](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649d4d5503460f94a2ce03/html5/thumbnails/1.jpg)
The Universe Around Us
• Geocentric = Earth-centered• Egocentric = Self-centered• Read Huygens quote (c. 1690) on page 3• Is there a center to the Universe?
This should be the whole course!• We have centers of motion: Solar System,
Milky Way Galaxy, clusters, etc..• Centers of motion caused by Gravity
![Page 2: The Universe Around Us Geocentric = Earth-centered Egocentric = Self-centered Read Huygens quote (c. 1690) on page 3 Is there a center to the Universe?](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649d4d5503460f94a2ce03/html5/thumbnails/2.jpg)
Cosmic History
• Big Bang Cosmology is a well accepted theory (12-16 billion years ago)
• Gravity drives the formation of our Milky Way galaxy (11-14 billion years ago)
• Gravity drives the formation of stars, and nuclear fusion in stars produces elements such as carbon, nitrogen, and oxygen
• Our solar system formed 4.6 billion years ago.• Our Earth and the other planets in the solar system
formed around our star: The Sun
![Page 3: The Universe Around Us Geocentric = Earth-centered Egocentric = Self-centered Read Huygens quote (c. 1690) on page 3 Is there a center to the Universe?](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649d4d5503460f94a2ce03/html5/thumbnails/3.jpg)
Light Travel Time
• Light travels at 300,000 km/s• Astronomical distances are measured in
light-years: 0.946 1013 km• Stars in our sky are many light- years away• Center of the Milky Way is 28,000
light-years away • Galaxies are millions to billions of
light-years away.• Observable universe: 12-16 billion
light-years in radius
![Page 4: The Universe Around Us Geocentric = Earth-centered Egocentric = Self-centered Read Huygens quote (c. 1690) on page 3 Is there a center to the Universe?](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649d4d5503460f94a2ce03/html5/thumbnails/4.jpg)
The Earth Rotates
![Page 5: The Universe Around Us Geocentric = Earth-centered Egocentric = Self-centered Read Huygens quote (c. 1690) on page 3 Is there a center to the Universe?](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649d4d5503460f94a2ce03/html5/thumbnails/5.jpg)
Relevant Geography
![Page 6: The Universe Around Us Geocentric = Earth-centered Egocentric = Self-centered Read Huygens quote (c. 1690) on page 3 Is there a center to the Universe?](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649d4d5503460f94a2ce03/html5/thumbnails/6.jpg)
Earth Orbits Sun
![Page 7: The Universe Around Us Geocentric = Earth-centered Egocentric = Self-centered Read Huygens quote (c. 1690) on page 3 Is there a center to the Universe?](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649d4d5503460f94a2ce03/html5/thumbnails/7.jpg)
Tilt of Spin Axis
![Page 8: The Universe Around Us Geocentric = Earth-centered Egocentric = Self-centered Read Huygens quote (c. 1690) on page 3 Is there a center to the Universe?](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649d4d5503460f94a2ce03/html5/thumbnails/8.jpg)
The Equinoxes and Solstices
• Tilt of the spin axis is related to the seasons
• Effect of tilt on climate is not instantaneous
![Page 9: The Universe Around Us Geocentric = Earth-centered Egocentric = Self-centered Read Huygens quote (c. 1690) on page 3 Is there a center to the Universe?](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649d4d5503460f94a2ce03/html5/thumbnails/9.jpg)
Cause of Seasons
a) The path of the Sun on Summer Solstice in the northern hemisphere
b) The path of the Sun on Winter Solstice in the northern hemisphere
![Page 10: The Universe Around Us Geocentric = Earth-centered Egocentric = Self-centered Read Huygens quote (c. 1690) on page 3 Is there a center to the Universe?](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649d4d5503460f94a2ce03/html5/thumbnails/10.jpg)
Precession of the Earth’s Axis