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History of astronomy
History of astronomy

... of the universe was just a model and had nothing to do with reality. Why did this happen? The political realities of the time made it dangerous to assert that the Earth was not the center of the world. Joshua (10:12) commanded the Sun to stand still, not the Earth. Psalm 93 states that “the world al ...
E8B4_CRT_CR_MSTIPS_FinalS
E8B4_CRT_CR_MSTIPS_FinalS

... 2. Which of the following BEST describes Earth’s location in the universe? A. Earth, Solar System, Sun B. Milky Way Galaxy, Solar System, Earth C. Solar System, Milky Way Galaxy, Sun D. Milky Way Galaxy, Earth, Solar System 3. What are stars, planets, and moons part of? A. Black Holes B. Comets C. N ...
Space and planets
Space and planets

... Pluto is composed primarily of rock and ice and is relatively small: approximately a fifth the mass of the Earth's Moon and a third its volume. It has an eccentric and highly inclined orbit that takes it from 30 to 49 AU (4.4–7.4 billion km) from the Sun. This causes Pluto periodically to come close ...
File
File

...  Its density is much less than the terrestrial planets, but it is believed to be mostly rock and ice  Forms a binary planet with its moon, Charon ...
Light Years Away
Light Years Away

... 6. The Oort cloud, is a spherical cloud of ______ situated about 50,000 AU from the Sun. A. Comets B. Asteroids C. Meteors D. Stars ...
ASTRonomy 103 - Solar Physics and Space Weather
ASTRonomy 103 - Solar Physics and Space Weather

... 22. The correct sequence of planets in our solar system from the Sun outward is A Mercury, Venus, Earth, Mars, Saturn, Uranus, Jupiter, Neptune. B Mercury, Earth, Venus, Mars, Jupiter, Saturn, Uranus, Neptune. C Mercury, Venus, Mars, Earth, Jupiter, Saturn, Uranus, Neptune. D *Mercury, Venus, Earth, ...
Concise pioneers of astronomy
Concise pioneers of astronomy

... Christian Doppler was an Austrian mathematician who lived between 1803-1853. He is known for the principle he first proposed in concerning the colored light of double stars in 1842. This principle is now known as the Doppler effect. He hypothesized that the pitch of a sound would change if the sourc ...
How many planets are there in the galaxy?
How many planets are there in the galaxy?

... To be clear, the actual number of stars in the Milky Way is subject to some dispute. Essentially, astronomers are forced to make estimates due to the fact that we cannot view the Milky Way from the outside. And given that the Milky Way is in the shape of a barred, spiral disc, it is difficult for us ...
Document
Document

... A) the direction toward Jupiter, because the gravity of this giant planet pulls the tail material toward it. B) the direction toward the Sun indicated by the tail direction, because gas and dust in the tail are attracted toward the Sun by its gravity. C) the direction away from the Sun, because the ...
Astronomy Study Guide
Astronomy Study Guide

... • Write the names of the planets in order starting from the one closest to the sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune • The rocky, dense planets are: Mercury, Venus, Earth, Mars – all closest to sun • The gas giants are: Jupiter, Saturn, Uranus, Neptune – furthest from su ...
Section 2 Astronomy 100 Fall 2003 Hour Exam 1
Section 2 Astronomy 100 Fall 2003 Hour Exam 1

... 28. According to modern theories, the most significant difference between the formation of the terrestrial and the large, outer planets is that A) both formed by accretion of rocky and icy planetesimals, but the terrestrial planets were close enough to the Sun that almost all of the ices escaped bac ...
Stream: sciences. E THIRD TERM ENGLISH EXAMINATION PART
Stream: sciences. E THIRD TERM ENGLISH EXAMINATION PART

... Read the text and do the activities: Our solar system consists of an average star we call the sun, the planets Mercury, Venus, Earth, Mars, Jupiter, Uranus, Neptune and Pluto. It includes also the satellites of the planets; numerous comets, asteroids, and meteoroids. The moon is the satellite rotati ...
astronomy - sfox4science
astronomy - sfox4science

... The universe is estimated to be over 10 billion years old. The universe is composed of galaxies, stars, planets, asteroids, comets, and meteors, each having different properties. Our solar system exists within the Milky Way galaxy. The known components of our solar system are the Sun, four terrestri ...
ScienceHelpNotes-UnitE1 - JA Williams High School
ScienceHelpNotes-UnitE1 - JA Williams High School

... Because of the predictable pattern of Earth’s revolution around the sun and the moon’s revolution around Earth, the  sun, Earth, and moon can align in a straight line relative to one another. This produces a shadow called an ​ ...
How was the Solar System Formed?
How was the Solar System Formed?

... Sun and Planets formed at about the same time out of a cloud of rotating gas and dust called a nebula. Matter from the Universe gathers into cloud 5 bya: Cloud forms when a supernova explodes. Under intense gravity and pressure caused the center of the solar nebula to become hotter and denser. At 10 ...
Unit Review Answers - click here
Unit Review Answers - click here

... 20. Both asteroids and meteroids are objects in space. Asteroids are usually larger than meteoroids. Asteroids are usually found in the asteroid belt but some are found near Earth. Meteoroids become meteors when they collide with the Earths atmosphere, if they reach Earth’s surface, then they are me ...
History of the Earth Ch 1
History of the Earth Ch 1

... B. Theory- _________________________________________________________ C. _______________________________ – most widely accepted scientific explanation of the formation of galaxies  Approximately _________________________________  ______________________________________________  Huge _______________ ...
Exoplanets and Tides
Exoplanets and Tides

... Our Solar System has a very dominant central sun, with more than 99% of the mass. ...
Patterns in the Night Sky Constellation: a grouping of stars, as
Patterns in the Night Sky Constellation: a grouping of stars, as

... Global positioning system (GPS) satellites travel in medium Earth orbits at about 11000km. They aid in navigation by transmitting signals down to GPS receivers on the ground, providing them with precise geographical coordinates of their location. Geostationary Orbit Satellites: Directly above the eq ...
Observing the Universe 1
Observing the Universe 1

... 14. The diagram in Figure 4 shows the movement of an object seen in the sky from November 2005 to January 2006. Is this object likely to be (a) a planet (b) a star ? (The lines show a grid of latitude and longitude on the star sphere) ...
File
File

... 5. The 4 innermost planets all have similar densities and compositions. 6. The 4 outer planets that are gas giants have similar densities and compositions. ...
Sun Moon and Stars Study Guide
Sun Moon and Stars Study Guide

... summer months? Would we have a greater amount of daylight in the summer months compared to the winter months? ...
A lesson on Gravity and the Solar System - ICE-CSIC
A lesson on Gravity and the Solar System - ICE-CSIC

... decided in 2006 to call Pluto a “dwarf planet,” reducing the list of “real planets” to 8. However, astronomers are now hunting for another planet, a true ninth planet. Evidence of its existence was unveiled on Jan. 20, 2016."Planet Nine" is about 10 times the mass of Earth (5,000 times the mass of P ...
unit1solarsystem-practicetest
unit1solarsystem-practicetest

... 19. The diagram in Figure 3 represents the moon’s orbit around Earth as viewed from space above Earth’s North Pole (NP). Letter A represents one position of the moon in its orbit. On the diagram, place an ​X on the moon’s orbit to indicate the position of the moon when a lunar eclipse would be obser ...
Chapter 1 - Humble ISD
Chapter 1 - Humble ISD

... • Earth is between __________________________ • Partial when only part of Moon is in shadow • Total when it all is in shadow • Solar eclipse: Moon is between ________________________ • Partial when only part of Sun is blocked • Total when it all is blocked • Annular when Moon is too far from Earth f ...
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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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