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... • Aristotle observes that during lunar eclipses the Earth’s shadow on the moon is curved • He assumes it will be curved for all eclipses • A hypothesis that explains this: the earth is round • A prediction of this theory is that the location of the stars in the sky should be different for observers ...
Distances in Space
Distances in Space

... Alpha Centauri (the next closest star) is 3.8x1013 km [or 38 000 000 000 000 km] • Units of Distance used to measure the distance from Earth to a star or galaxy are LIGHT YEARS ...
Name
Name

... B) the varying speed of the Earth in its orbit about the Sun. C) the precession of the Earth's rotation axis. D) the tilt of the Earth's rotation axis relative to the ecliptic. E) the tilt of the Moon's orbital plane relative to the ecliptic. 36) Which object is not considered a star? A) The Sun B) ...
Solar system junior
Solar system junior

... The Sun, a star that is much larger than the Earth, illuminates us with its light and warms us with its heat. For this reason it is important for all living beings because it enables the life of plants, animals and humans. The Sun is part of the Solar System together with eight other planets. The pl ...
123mt13a
123mt13a

... The most accurate astronomical clock which is available to the naked eye is The position of the Sun with respect to the stars The phases of the Moon (this is an arbitrary clock) The position of Mars with respect to the Zodiac Constellation The position of Jupiter with respect to the Zodiac Constella ...
Lecture 43: Extraterrestrial Life
Lecture 43: Extraterrestrial Life

... Our ideas are informed by evolution and biochemistry. Universal versus Parochial (limited) characteristics Convergent Evolution versus Radical Diversity Silicon chemistry as an alternative to Carbon for biochemistry? Ammonia as alternative to Water as a biochemical solvent? Life without Chemistry? ...
IN THE CENTRE OF THE SUN IT ABOUT 15 MILLION DEGREES
IN THE CENTRE OF THE SUN IT ABOUT 15 MILLION DEGREES

... The only thing that has ever landed on it is a satellite called Voyager 2 and took some amazing pictures! ...
The Newtonian Revolution: The discovery of natural law
The Newtonian Revolution: The discovery of natural law

... Ptolemy: Dogmatic, or Innovative Mathematical Modeler? • We don’t know for sure. • Some evidence suggests that he was agnostic on where the center of the solar system was. He just wanted the simplest, most concise calculation device for determining the positions of the planets – BIG success here! ...
1 HoNoRS227 Examination #3 Name
1 HoNoRS227 Examination #3 Name

... Because the star is so far away, the scientist could not have the time to receive the radio signals from such a planet. B Because the star is so close that we should have received radio signals from the planet years ago. C Because the radio signals cannot penetrate the Earth’s atmosphere from outer ...
02 - University of New Mexico
02 - University of New Mexico

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Key 3 - UNLV Physics
Key 3 - UNLV Physics

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A Solar System - Cloudfront.net
A Solar System - Cloudfront.net

... The Milky Way: Our galaxy containing up to 400 billion solar systems. Earth is located on one spiral arm. ...
Name: Class: Date: Label the parts of the solar system. Complete
Name: Class: Date: Label the parts of the solar system. Complete

... with a radius of 5 cm? Facts: The radius of the Earth is 6 370 km; the radius of Mars is 3 397 km. ...
Scale Model of the Solar System
Scale Model of the Solar System

... a large number of interplanetary bodies (comets, asteroids, meteoroids, interplanetary dust particles) • Much information has been gathered by telescopes and space probes – Images reveal surface features (geology) and atmospheric conditions – Spectroscopic information (analysis of light from excited ...
History of astronomy - Part I.
History of astronomy - Part I.

... showed that it was due to microorganisms. ...
Sizing-up the planets activity
Sizing-up the planets activity

... *Note: use drawing compass to draw smaller, inner planets. Use 22 cm piece of string to draw larger outer planets by holding one end of string on the paper with one finger and placing pencil at other end of string and tracing a circle. Adjust string length for each outer planet with Jupiter having 2 ...
word document
word document

... is 2π/day), r (which is Rearth) and the sine of the angle between them which is the co-latitude [or cosine of the latitude, which for Memphis would be cos(35)]. Further,  cross this vector would be in the direction {North and up} cross {East} = {down and to the North}. The minus sign in front mean ...
The “Big Bang” Theory
The “Big Bang” Theory

... Earth in meteorites. • Organic material is carbon based compounds and is part of all life as we know it. • It may have been lightning that made these compounds become “alive”. • Water was necessary for life to evolve and this may have come from comets • Oxygen in the atmosphere was given off by earl ...
Models of the solar system
Models of the solar system

... •aphelion: the farthest point from the sun in an orbit ...
Chapter 2: Emergence of Modern Astronomy
Chapter 2: Emergence of Modern Astronomy

... • He thought Ptolemy’s model was contrived • Yet he believed in circular motion • HELIOCENTRIC!!!! • His ideas were published just before he died • Retained epicycles • Better model (more simplistic) but still not elegant ...
IMPORTANT HISTORICAL DATES AND EVENTS
IMPORTANT HISTORICAL DATES AND EVENTS

... The planets where shaped by the nearby sun and ended up rocky, small and dense, with at least one, Earth, orbiting at just the right distance to hold on to watery oceans and host the chemical of life. The planets can be divided up into two groups of four. Closest to the sun are the four inner planet ...
Solar System Text - Spring Creek Elementary
Solar System Text - Spring Creek Elementary

... caused by erosion when water flows downhill, so we can make an inference—a conclusion based on evidence and reasoning--that there was a lot of water on the planet long ago. There are areas in the southern hemisphere of Mars where this is the case. Our robotic spacecraft have confirmed what visual ev ...
The Universe and Space Travel
The Universe and Space Travel

... Set of 10 equations in Albert Einstein's general theory of relativity that describes the fundamental interaction of gravitation as a result of spacetime being curved by matter and energy. First published by Einstein in 1915 as a tensor equation. Reduces to Newton’s law of gravitation when gravity is ...
The Solar System
The Solar System

... • From 1930 – 2006 Pluto was considered to be the ninth planet in the Solar System. • New definitions of planets excluded Pluto and added it to the “Dwarf Planet” category due to the fact its tilted orbit crosses the orbit of Neptune. – Astronomers suspect there are up to 2000 Dwarf planets, with as ...
Chapter 01
Chapter 01

... which are contained inside others. In other words, this chapter will give us perspective for all of our exploration to follow. It is easy to learn a few facts, but it is the relationships between facts that are interesting. The relationships illustrated in this chapter will give us a perspective on ...
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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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