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Navigation
Navigation

... The Global Positioning System (GPS) • is a worldwide radio-navigation system formed from a constellation of 24 satellites and their ground stations. • GPS uses these "man-made stars" as reference points to calculate positions accurate to a matter of meters. In fact, with advanced forms of GPS you ...
Lecture 8 - Kepler and Brahe
Lecture 8 - Kepler and Brahe

... that this is a voluntary choice based on his attitude. He refused to add epicycles. But now, of course, he had no model of the motions of the planets. Kepler realized that to get the most out of Tycho’s data, he first needed to determine the Earth’s orbit, since all planetary observations are made f ...
The Earth
The Earth

... revolution period around the earth is the same length and direction as its rotation period, which results in the moon always keeping one side turned toward the earth and the other side turned away from the earth. This type of motion is called synchronous rotation. The side turned away from the earth ...
doc Brandon`s (Precise Final Rev.)
doc Brandon`s (Precise Final Rev.)

... Gravity was not great enough on the moon or Mars to hold the water onto its surface ...
Lunar Phases and Eclipses
Lunar Phases and Eclipses

... within Earth’s umbral shadow, indirect sunlight still manages to reach and illuminate it. However, this sunlight must first pass deep through the Earth’s atmosphere which filters out most of the blue colored light. ...
PDF - BYU Studies
PDF - BYU Studies

... found statements regarding celestial objects. As an astronomer, I am drawn to ask: Do those statements indicate a correct understanding of nature—perhaps even beyond the science of his day? This article discusses the historical and scientific background of one such statement in the Pearl of Great Pr ...
The Runaway Universe - Astronomy & Astrophysics Group
The Runaway Universe - Astronomy & Astrophysics Group

... through so many ages have been resolved, and we are at last freed from wordy debates about it. The galaxy is, in fact, nothing but a collection of innumerable stars grouped together in clusters. Upon whatever part of it the telescope is directed, a vast crowd of stars is immediately presented to vie ...
Slide 1
Slide 1

... falling from space) is a meteor. • Most meteors are completely harmless. They are usually very small (the size of a grain of rice perhaps) and they get so hot as they fall to Earth, that most are completely destroyed! • If any part of the meteor does survive and crashes to the ground, this is called ...
Astronomy Unit review questions: - need a calculator, something to
Astronomy Unit review questions: - need a calculator, something to

... The High tides are on the side_____________ the Moon and the side ____________. The Low tides are on the sides that form a _______0 angle with the Moon. It takes ____________ hours to go from high tide to low tide. A Neap tide is said to have a ___________ High tide and _________ Low tide? A spring ...
Part II: Ideas in Conflict.
Part II: Ideas in Conflict.

... Constellations and Asterisms Usually we think of a constellation as a particular grouping of stars that may “look” like some stick figure man, lion, etc. Many of these grouping of stars have been identified by various names in various nations over past history. To make things more uniform, the Inte ...
Comparing the Chemical Compositions of the Sun and Earth
Comparing the Chemical Compositions of the Sun and Earth

... within about 4 AU (the snowline) and a more refractory solid beyond 4 AU. Similar consideration of the ices NH3 and CH4 explain why H, C and N are only partially depleted. Fe, Mg Ni,Ca, Al, Cr, Ti, V, Sr and Zr are refractory elements and have relative abundances that have not changed since the Eart ...
Planets and Transits
Planets and Transits

... objects of solar metallicity) are "brown dwarfs" (no matter how they formed) while objects with true masses below this limiting mass are "planets". 2) Free-floating objects in young star clusters (which presumably formed in the same manner as stars and have not been shown to be ejected from planetar ...
PHYSICS 1500 - ASTRONOMY TOTAL: 100 marks Section A Please
PHYSICS 1500 - ASTRONOMY TOTAL: 100 marks Section A Please

... Why does the disk of our galaxy appear blue? (a) all the red starlight is scattered out of our view. (b) the blue light is recombination radiation from HII regions. (c) the blue light is emission from elements in the interstellar medium heavier than hydrogen. (d) it is illuminated by the Magellanic ...
Coordinate System Notes 3 - School District of La Crosse
Coordinate System Notes 3 - School District of La Crosse

... 1, No meaning to the arrangement except through imagaination 2. Many are associated with Greek mythology because we related to the greek culure more, other cultures had their own intepertation of the stars. C. 1603 John Bayer assigned greek letters to the brightest of the stars in order of magnitude ...
The Outer Planets and Their Moons
The Outer Planets and Their Moons

... kg/m3 and assuming that its composition is the same as the Sun – 86.1% molecular hydrogen (by number of molecules) and 13.8% helium. it is thought that the Sun and planets condensed from the same cloud of gas and dust and that the Sun and gas giants should have nearly the same composition.) At 150 k ...
ISP 205: Visions of the Universe
ISP 205: Visions of the Universe

... in the local Solar neighborhood… • typical relative speeds of more than 70,000 km/hr • but stars are so far away that we cannot easily notice ...
Teacher: Mrs. Zimmerman Astronomy Part 2 Practice Test 1. In the
Teacher: Mrs. Zimmerman Astronomy Part 2 Practice Test 1. In the

... 38. [Refer to figure 8] A total solar eclipse sometimes occurs when the Moon is at position A. Explain why a total solar eclipse does not occur every time the Moon is at position A. --------------------------39. Base your answer to the question on the diagram below, which shows Earth as viewed from ...
1. What are the four branches of earth? -Geology
1. What are the four branches of earth? -Geology

... When the sun is at its highest point in the sky it is 12pm noon. Because of the suns movements from east to west the sun will appear at different locations throughout the day and that will be that locations 12 pm noon because of its highest location in the sky at that location. This allows for diffe ...
MG Pre-test - Document
MG Pre-test - Document

... A. the batteries are hooked in series and the light bulbs are hooked in series. B. the batteries are hooked in parallel and the light bulbs are hooked in parallel. C. the batteries are hooked in series and the light bulbs are hooked in parallel. D. the batteries are hooked in parallel and the light ...
File
File

... amount of information about them and their place in the universe. 1. What is Light? Light is a form of electromagnetic radiation. This means that it: a) Travels in waves (at the speed of light: 300,000 km/s) b) Does not need a medium for travel = can move through space Electromagnetic waves emitted ...
“The Southern Cross”
“The Southern Cross”

... spheres, each with a different period of revolution. It was a far from accurate model, but it started a tradition which others followed. Aristotle was one of those who later expanded and refined this model into his well-known geocentric model. The premise underlying this was a core philosophical pos ...
Monday, March 3
Monday, March 3

... • Revealing great, unusual, and remarkable spectacles, opening these to the consideration of every man, and especially of philosophers and astronomers; • As observed by Galileo Galilei, gentleman of Florence, Professor of Mathematics in the University of Padua • With the aid of a Spyglass recently i ...
Why is it so difficult to detect planets around other stars? Planet
Why is it so difficult to detect planets around other stars? Planet

... the Sun with spectral lines that are slightly redshifted then slightly blueshifted with a repeating period of 16 months—what could you ...
Oct 20 Morality, mysticism, magic in late antiquity
Oct 20 Morality, mysticism, magic in late antiquity

... Strabo world map History of astrology Ideas of how heavenly bodies might affect life on earth ...
Renaissance Astronomy - Faculty Web Sites at the University of
Renaissance Astronomy - Faculty Web Sites at the University of

... Florence, and put their heads together in a mad quest for some means by which they could damage you, either with regard to the motion of the Earth or otherwise. One of them asked a preacher to state from the pulpit that you were asserting outlandish things. The priest, seeing the animosity against y ...
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Extraterrestrial life



Extraterrestrial life is life that does not originate from Earth. It is also called alien life, or, if it is a sentient and/or relatively complex individual, an ""extraterrestrial"" or ""alien"" (or, to avoid confusion with the legal sense of ""alien"", a ""space alien""). These as-yet-hypothetical life forms range from simple bacteria-like organisms to beings with civilizations far more advanced than humanity. Although many scientists expect extraterrestrial life to exist, so far no unambiguous evidence for its existence exists.The science of extraterrestrial life is known as exobiology. The science of astrobiology also considers life on Earth as well, and in the broader astronomical context. Meteorites that have fallen to Earth have sometimes been examined for signs of microscopic extraterrestrial life. Since the mid-20th century, there has been an ongoing search for signs of extraterrestrial intelligence, from radios used to detect possible extraterrestrial signals, to telescopes used to search for potentially habitable extrasolar planets. It has also played a major role in works of science fiction. Over the years, science fiction works, especially Hollywood's involvement, has increased the public's interest in the possibility of extraterrestrial life. Some encourage aggressive methods to try to get in contact with life in outer space, whereas others argue that it might be dangerous to actively call attention to Earth.
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