• Study Resource
  • Explore Categories
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Celestial Objects
Celestial Objects

... located in the asteroid belt, a wide area between the orbits of Mars and Jupiter. The asteroid belt separates the inner planets from the outer planets. A meteoroid is another type of rocky object moving in space between the planets. Meteoroids are smaller than asteroids. Most meteoroids that enter E ...
Chapter 2 - El Camino College
Chapter 2 - El Camino College

sc_examII_fall_2002 - University of Maryland
sc_examII_fall_2002 - University of Maryland

... 2. According to Einstein’s theory of general relativity, the gravitational force results from A. pressure exerted by radiation. B. interatomic forces between masses. C. curvature of space by mass. D. the expansion of the universe. E. the relative weights of the objects involved. 3. The 65 million ye ...
MLAwiki
MLAwiki

... 2. Asteroid __________- region between Mars and Jupiter where most asteroids orbit the sun a. As many as a million asteroids make up this belt orbiting the sun b. Not all of these asteroids stay in their orbits c. Sometimes asteroids are pulled out of orbit by the gravity of other planets or even th ...
The Life Cycle of a Star Webquest
The Life Cycle of a Star Webquest

... ______ The gas and dust compresses into a slowly rotating ball. ______ The gas ball begins to spin faster and cool. ______ A star begins to form from clouds of hydrogen gas and dust. ______ The ball separate into a core and spinning disks. 3. How long can a star stay a protostar? ___________________ ...
Target Stars for Earth-like Planet Searches with the Terrestrial
Target Stars for Earth-like Planet Searches with the Terrestrial

... scale required, and the possibility of dust emission masking the planet's signature, combine to make the overall TPF problem challenging. ...
File
File

... away. There are only 11 stars (not including the sun) that are less than 10 light years away from earth. Most stars are much farther away than that. Many stars that we see at night are several thousand light years away. This means that from earth we can only see these stars as they existed thousands ...
Document
Document

... compare the magnitude of the gravitational force exerted on a 3 kg baby by a) a 70 kg obstetrician who is 1 m away and roughly estimated as a point particle b) the massive planet Jupiter (m=2 x 1027 kg) at its closest approach to Earth (=6 x 1011m) c) What do you think about this claim? 2. Certain n ...
Prospecting for Planets – Radial Velocity Searches
Prospecting for Planets – Radial Velocity Searches

... What can we learn about planets found by Radial Velocity? Fig 5 – This is an example of the sort of data found by RV observations. The vertical axis shows how the stars velocity in our direction changes, compared to time on the horizontal axis. If the star has a companion, we expect to see a repetit ...
AST1001.ch3
AST1001.ch3

The Solar System
The Solar System

... – All planets except Mercury and Venus have satellites – All Jovian planets have rings ...
astronomy timeline
astronomy timeline

... William Herschel discovers speed and direction of Sun's motion. Herschel analyzed the motions of seven bright stars and showed that part of their motions was due to the motion of the Sun through space. p. 371-373, F ...
What is the net result of the proton-proton chain? a. 2 protons make
What is the net result of the proton-proton chain? a. 2 protons make

First Exam - University of Iowa Astrophysics
First Exam - University of Iowa Astrophysics

... 26. You look up in the night sky and see the planet Jupiter, the planet Mars, and the Moon very close together. You know that they are located in or close to one of the following. Which is it? (a) the ecliptic ∗ (b) the celestial equator (c) the zenith (d) the north celestial pole (e) the constellat ...
chapter1lecture
chapter1lecture

Chapter 25 - Notes Super Size
Chapter 25 - Notes Super Size

... » Depending on the mass of the core, one of the _________________ will occur: 1.) _________________ Star- smaller cores will produce a dense core of neutrons about 20km in diameter. 2.) Black Hole- larger cores will collapse to a super dense _________________. The gravity near this mass is so strong ...
the copernican revolution - University of Florida Astronomy
the copernican revolution - University of Florida Astronomy

... Geocentric vs. Heliocentric Model How can we distinguish between the models? Heliocentric: We should be able to observe phases on inferior planets, similar to the phases of the moon. ...
The Sun
The Sun

... are stars that smaller and larger than our sun. The sun is just the right size and distance from Earth so that there can be life on our planet.  There are stars that are much larger than our sun. A star in the Orion constellation called Betelgeuse is 400 times larger than our sun. If our sun was th ...
angular size - Particle and Astroparticle Physics
angular size - Particle and Astroparticle Physics

... • In the 1860s, the Scottish mathematician and physicist James Clerk Maxwell succeeded in describing all the basic properties of electricity and magnetism in four equations • This mathematical achievement demonstrated that electric and magnetic forces are really two aspects of the same ...
Venus - Mr. Nussbaum
Venus - Mr. Nussbaum

... same side of the sun, the two planets may come within 25,500,000 miles of each other. When they are on opposite sides of the sun, they may be as far as 162,000,000 miles apart. ...
The Evening Sky in February 2016
The Evening Sky in February 2016

... distant star; 13 000 times brighter than the sun and 300 light years away. The Milky Way is brightest in the southeast toward Crux. It can be traced up the sky, fading where it is nearly overhead. It becomes very faint east or right of Orion. The Milky Way is our edgewise view of the galaxy, the pan ...
Introduction To Astronomy
Introduction To Astronomy

The Milky Way Galaxy
The Milky Way Galaxy

... found on the edges of the galaxy. • Harlow Shapley found the distance to these clusters and he plotted their positions. • For them to fit, the Milky Way must be around 30 kpc across. (Shapley miscalcuated to around 40 kpc. ...
Sun - Midlandstech
Sun - Midlandstech

... very minor influence on seasonal temperature variations. ...
Earth Science 24.3B The Sun`s Interior
Earth Science 24.3B The Sun`s Interior

...  The conversion of just one pinheads worth of hydrogen to helium generates more energy than burning thousands of tons of coal.  Most of this energy is in the form of high-energy photons that work their way toward the solar surface.  The photons are absorbed and reemitted many times until they rea ...
< 1 ... 189 190 191 192 193 194 195 196 197 ... 373 >

Rare Earth hypothesis



In planetary astronomy and astrobiology, the Rare Earth Hypothesis argues that the origin of life and the evolution of biological complexity such as sexually reproducing, multicellular organisms on Earth (and, subsequently, human intelligence) required an improbable combination of astrophysical and geological events and circumstances. The hypothesis argues that complex extraterrestrial life is a very improbable phenomenon and likely to be extremely rare. The term ""Rare Earth"" originates from Rare Earth: Why Complex Life Is Uncommon in the Universe (2000), a book by Peter Ward, a geologist and paleontologist, and Donald E. Brownlee, an astronomer and astrobiologist, both faculty members at the University of Washington.An alternative view point was argued by Carl Sagan and Frank Drake, among others. It holds that Earth is a typical rocky planet in a typical planetary system, located in a non-exceptional region of a common barred-spiral galaxy. Given the principle of mediocrity (also called the Copernican principle), it is probable that the universe teems with complex life. Ward and Brownlee argue to the contrary: that planets, planetary systems, and galactic regions that are as friendly to complex life as are the Earth, the Solar System, and our region of the Milky Way are very rare.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report