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View SKYTRACK_Glossary of Terms
View SKYTRACK_Glossary of Terms

... and Venus) occasionally cross directly in front of the Sun, where they appear as dark dots against the bright disk of the Sun. Tropical year – The length of time that the Sun, as viewed from the Earth, takes to return to the same position along the ecliptic, such as a solstice or equinox. The mean i ...
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Pythagoras Eudoxus of Cnidus Aristotle Eratosthenes Hipparchus

Astronomy - Educator Pages
Astronomy - Educator Pages

... 2)In which months is the southern hemisphere most directly in the sun? 3)Is there a time when the northern and southern hemispheres are equally exposed to the sun? 4)What do you call the day when the Northern hemisphere is most directly in the sun (the longest day of the year in the northern hemisph ...
Course Expectations
Course Expectations

... Low mass stars produce white dwarfs, and planetary nebulae Parallax, Cepheid’s and standard candles are methods used to measure distance in space ...
AST301.Ch16.Sun
AST301.Ch16.Sun

Origin of the Universe and of the Solar System
Origin of the Universe and of the Solar System

FLASHBACKS - Clinton County High School
FLASHBACKS - Clinton County High School

... Start measuring the mass of you object. B. Turn all of the balances to “0” and then measure. C. Check to see if your balance is level and needs adjusting. A. ...
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Earth`s Internal Structure I

... If we could measure R, we could determine M. ...
Measuring the Masses of Galaxies in the Sloan Digital Sky Survey
Measuring the Masses of Galaxies in the Sloan Digital Sky Survey

... The redshift z is an observed property of a galaxy (or quasar). It tells us the relative size of the Universe now with respect to the size of the Universe when light left the galaxy (or quasar). (1 + z) = (size now) / (size then) ...
Friday, Sep. 5
Friday, Sep. 5

... Syllabus, class notes, and homeworks are at: www.as.utexas.edu  courses  AST 301, Lacy Reading for this week: chapter 3 (4 by next Wednesday) The homework handed out today is due in two weeks. It requires observations of the Moon and planets. We will take this week’s homework next Monday if you ha ...
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... Law of Universal Gravitation allowed extremely accurate predictions of planetary orbits.  Cavendish measured gravitational forces between human-scale objects before 1800. ...
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PHASES OF THE MOON

... The inner and outer planets are separated by the Asteroid Belt between Mars and Jupiter. Moons of other planets have similarities and differences to our own Moon. Similarities Differences Are called satellites Orbit around the planet ...
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... fastest Earth is moving the 2. aphelion: _________________________ slowest _________________________________________ ...
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20 Stars/Distances/Magnitudes

... 3. You see a star in the night sky, and you look up its distance to be 10 parsecs. What would you expect to observe for a parallax angle for this star? ...
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teachers` answers for Secondary Visit Guide and Activities

... What are they part of? The electromagnetic spectrum Why do we use infrared telescopes to look at objects in space? Infrared light can penetrate dust allowing us to see more of the object. What do you think might affect an infrared telescope on Earth? The atmosphere absorbs a lot of infrared light. W ...
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Formation of the Solar System . • Questions

... • Left just protoplanets + remaining planetesimals to finish up their interactions. • Timescale to this point: only ~ 10 million years. ...
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... However, the Universe is so big that it takes a long time for light to travel from one galaxy to another. It takes 2.5 million years for light from the nearby Andromeda Galaxy to reach us. If you look at the Andromeda Galaxy today, you see it as it looked 2.5 million years ago. ...
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Our Place in the Universe (Chapter 1) The Structure and Size of the

... However, the Universe is so big that it takes a long time for light to travel from one galaxy to another. It takes 2.5 million years for light from the nearby Andromeda Galaxy to reach us. If you look at the Andromeda Galaxy today, you see it as it looked 2.5 million years ago. ...
Celestial Mechanics
Celestial Mechanics

... Kepler traced out the orbits of the planets, and combined with temporal information, arrived at three empirical laws of motion. ...
Acquaintance with solar system. By Edgaras Montvila 6D
Acquaintance with solar system. By Edgaras Montvila 6D

... because of its immense gravity well and location near the inner Solar System. It receives the most frequent comet impacts of the Solar System’s planets. Jupiter has 67 satellites. The four largest moons you can see from Earth with binoculars on a clear night. They are Io, Europa, Ganymede, and Calli ...
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Ch.2: Celestial Mechanics

... NB: This simple form of K3 only works for our solar system. Why? ...
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Today`s Powerpoint

... photons. Only hottest stars produce many of these. ...
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... • What is a sidereal day and and solar day? 1. A sidereal day is the amount of time it takes the sun to repeat its position in the sky. A solar day is the amount of time it takes for a star to repeat its position in the sky. 2. A solar day is the length of the day at the Tropic of Capricorn at solst ...
The Big Bang Demonstration
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... In a similar way, the theory is that at the center of this spinning cloud, a small star began to form. This star grew larger and larger as it collected more and more of the dust and gas that collapsed into it. Further away from the center of this mass where the star was forming, there were smaller c ...
Volume 1 (Issue 3), March 2012
Volume 1 (Issue 3), March 2012

... These spots could easily be seen through any small telescope but during a foggy day it is a great opportunity to view bigger ones. Sunspots have always been mysterious for human beings and without these spots on it; Sun would rather be a boring star! The human observation of sunspots is very old and ...
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Astronomical unit

The astronomical unit (symbol au, AU or ua) is a unit of length, roughly the distance from the Earth to the Sun. However, that distance varies as the Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year. Originally conceived as the average of Earth's aphelion and perihelion, it is now defined as exactly 7011149597870700000♠149597870700 meters (about 150 million kilometers, or 93 million miles). The astronomical unit is used primarily as a convenient yardstick for measuring distances within the Solar System or around other stars. However, it is also a fundamental component in the definition of another unit of astronomical length, the parsec.
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