Extra-Solar Planets
... the number of stars in the Milky Way the fraction of stars that have “habitable planets” the number of habitable planets per system the fraction of habitable planets where life evolves the fraction of life-planets that evolve intelligence the fraction of civilizations that communicate the fraction o ...
... the number of stars in the Milky Way the fraction of stars that have “habitable planets” the number of habitable planets per system the fraction of habitable planets where life evolves the fraction of life-planets that evolve intelligence the fraction of civilizations that communicate the fraction o ...
Blinn College Department of Physics
... Most of the factors are highly uncertain. Possible results range from 1 communicative civilization within a few dozen light years to us being the only communicative civilization in the Milky Way. ...
... Most of the factors are highly uncertain. Possible results range from 1 communicative civilization within a few dozen light years to us being the only communicative civilization in the Milky Way. ...
ASTR 300 Stars and Stellar Systems Fall 2011
... 5. Suppose you are on Mercury, 0.39 AU from the Sun. How bright would the Sun appear compared to its brightness as seen from the Earth? The brightness is given by the flux you see. From slide 8 of Lecture 7, the flux goes as the luminosity over the distance squared. For the earth d = 1AU, while for ...
... 5. Suppose you are on Mercury, 0.39 AU from the Sun. How bright would the Sun appear compared to its brightness as seen from the Earth? The brightness is given by the flux you see. From slide 8 of Lecture 7, the flux goes as the luminosity over the distance squared. For the earth d = 1AU, while for ...
student instruction and answer sheet
... three depending on if you include Venus or Mars. If Saturn were to migrate into the habitable zone, its 22 moons would make this number much larger. fl – This number represents the fraction of earth-like planets where life actually develops. Some scientists believe that the evolution of life is inev ...
... three depending on if you include Venus or Mars. If Saturn were to migrate into the habitable zone, its 22 moons would make this number much larger. fl – This number represents the fraction of earth-like planets where life actually develops. Some scientists believe that the evolution of life is inev ...
Temperature Gradient - FIU Faculty Websites
... discussed in class). Inside a star, the ratio T 3 /ρ does not vary enormously, and the required dT /dr will be determined primarily by the opacity hκi and the luminosity L(r). Large values of either of these two may require large dT /dr’s, and the question then arises whether the temperature gradien ...
... discussed in class). Inside a star, the ratio T 3 /ρ does not vary enormously, and the required dT /dr will be determined primarily by the opacity hκi and the luminosity L(r). Large values of either of these two may require large dT /dr’s, and the question then arises whether the temperature gradien ...
Phys 1830: Lecture 33 - University of Manitoba Physics Department
... Dimitar Sasselov TED talk 2010: 100 million habitable planets. Sara Seager TEDX talk 2013: ~2 dozen Earth-like planets discovered. ...
... Dimitar Sasselov TED talk 2010: 100 million habitable planets. Sara Seager TEDX talk 2013: ~2 dozen Earth-like planets discovered. ...
1 A future news release might report that a new planet has been
... A future news release might report that a new planet has been found around a star very similar to our sun. This newly discovered planet is claimed to have a mass 40 times that of Earth and is located nearly 25 AU from the star it orbits. Which of the following would be reasonable predictions about t ...
... A future news release might report that a new planet has been found around a star very similar to our sun. This newly discovered planet is claimed to have a mass 40 times that of Earth and is located nearly 25 AU from the star it orbits. Which of the following would be reasonable predictions about t ...
Goal: To understand life in our universe.
... • Lets suppose we sent a craft to the alpha Centauri system at a speed of 0.1 c. • It would take 43 years to get there… • The large distances make interplanetary travel unlikely for a long time – and even then very impractical. ...
... • Lets suppose we sent a craft to the alpha Centauri system at a speed of 0.1 c. • It would take 43 years to get there… • The large distances make interplanetary travel unlikely for a long time – and even then very impractical. ...
SR 51(5) 19-21
... around 7,000o°C. Jupiter, Saturn, Uranus and Neptune are made up of gases and are also very cold, much colder than any place on Earth. Thus in our solar system, Earth seems to be the only planet where we know for sure there is life. Europa and a number of other moons in the outer Solar System have i ...
... around 7,000o°C. Jupiter, Saturn, Uranus and Neptune are made up of gases and are also very cold, much colder than any place on Earth. Thus in our solar system, Earth seems to be the only planet where we know for sure there is life. Europa and a number of other moons in the outer Solar System have i ...
Steepening of Acoustic Waves 1 Basic Fluid Mechanics S. R. Kulkarni
... For an ideal fluid these three quantities are related by Boyle’s law. However, if additional conditions are applicable then the fluid can be described by only of the three quantities. For example, if all changes are isothermal then P ∝ ρ. On the other hand, if the changes are too rapid to have any h ...
... For an ideal fluid these three quantities are related by Boyle’s law. However, if additional conditions are applicable then the fluid can be described by only of the three quantities. For example, if all changes are isothermal then P ∝ ρ. On the other hand, if the changes are too rapid to have any h ...
24. Life Beyond Earth: Prospects for Microbes, Civilizations, and
... • The Drake equation says that the number of civilizations in the Milky Way Galaxy is NHP x flife x fciv x fnow, where NHP is number of habitable planets in the galaxy, flife is the fraction of these habitable planets actually have life on them, fciv is the fraction of the lifebearing planets upon w ...
... • The Drake equation says that the number of civilizations in the Milky Way Galaxy is NHP x flife x fciv x fnow, where NHP is number of habitable planets in the galaxy, flife is the fraction of these habitable planets actually have life on them, fciv is the fraction of the lifebearing planets upon w ...
Lecture 39: Life in the Universe The Main Point Simple Life vs
... N = Number of civilizations in the Galaxy capable of communicating with us R* = The rate of star formation in the Galaxy (stars/year) fs = fraction of stars that are Sun-like Np = number of planets per star fe = fraction of "environmentally correct" planets fL = fraction of planets where life develo ...
... N = Number of civilizations in the Galaxy capable of communicating with us R* = The rate of star formation in the Galaxy (stars/year) fs = fraction of stars that are Sun-like Np = number of planets per star fe = fraction of "environmentally correct" planets fL = fraction of planets where life develo ...
Where Is Everybody? - Center for Peripheral Studies
... “glorious accident,” a wildly improbable, wholly coincidental, and never-to-berepeated series of biological events stretching over four billion years and resulting (not “culminating”) in the emergence of a conscious, artifactual intelligence. We are completely unlike anything else that could ever be ...
... “glorious accident,” a wildly improbable, wholly coincidental, and never-to-berepeated series of biological events stretching over four billion years and resulting (not “culminating”) in the emergence of a conscious, artifactual intelligence. We are completely unlike anything else that could ever be ...
Chapter 20
... Among all of the planets and moons, only a few have nonzero odds for life. Mars has provided the best evidence thus far, but it is still very controversial (see figure). Moreover, even if real, life on Mars might not have been independent of Earth—a meteorite from Mars containing simple life may hav ...
... Among all of the planets and moons, only a few have nonzero odds for life. Mars has provided the best evidence thus far, but it is still very controversial (see figure). Moreover, even if real, life on Mars might not have been independent of Earth—a meteorite from Mars containing simple life may hav ...
Name____________________________________________
... __1__ The Universe 3. What is a galaxy? A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity. 4. What does an elliptical galaxy look like? Round or flattened ball; smashed circle 5. The Milky Way Galaxy is just one of billions of galaxies in the universe ...
... __1__ The Universe 3. What is a galaxy? A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity. 4. What does an elliptical galaxy look like? Round or flattened ball; smashed circle 5. The Milky Way Galaxy is just one of billions of galaxies in the universe ...
Colonization of the Milky Way The distances between the stars are
... They wouldn’t even have to do it themselves. Another possibility would be to send selfreplicating machines that make copies of themselves from the local resources of any system they found. Incidentally, this argument does not work when we consider the distances between galaxies. For example, the nea ...
... They wouldn’t even have to do it themselves. Another possibility would be to send selfreplicating machines that make copies of themselves from the local resources of any system they found. Incidentally, this argument does not work when we consider the distances between galaxies. For example, the nea ...
Lecture12
... Convection A bubble of gas that is lower density than its surroundings will rise buoyantly From the ideal gas law: if gas is in approximate pressure equilibrium (i.e. not expanding or contracting) then pockets of gas that are hotter than their surroundings will also be less dense. ...
... Convection A bubble of gas that is lower density than its surroundings will rise buoyantly From the ideal gas law: if gas is in approximate pressure equilibrium (i.e. not expanding or contracting) then pockets of gas that are hotter than their surroundings will also be less dense. ...
AST101_lect_18
... •We are at the right galacto-centric distance •The solar system is the right metallicity •The Sun is rather inactive •Earth is in just the right place in the habitable zone •The Moon stabilizes Earth's rotation •Earth is just the right mass to be tectonically active •Jupiter protects the Earth from ...
... •We are at the right galacto-centric distance •The solar system is the right metallicity •The Sun is rather inactive •Earth is in just the right place in the habitable zone •The Moon stabilizes Earth's rotation •Earth is just the right mass to be tectonically active •Jupiter protects the Earth from ...
ASTRONOMY WORKSHOP
... Density is denoted as “d,” while “dc” stands for critical density. The 'critical density' is the average density of matter required for the Universe to just halt its expansion, but only after an infinite time. ...
... Density is denoted as “d,” while “dc” stands for critical density. The 'critical density' is the average density of matter required for the Universe to just halt its expansion, but only after an infinite time. ...
2016-Semester Exam-FALL-Review
... 25. Circle the reactants in the above equation. Put a rectangle around the products. 26. How many elements are shown in the above equation? 27. What is the difference between a compound and a molecule?—Give an example of each. 28. How many atoms of Na are on the reactants side? 29. How can you tell ...
... 25. Circle the reactants in the above equation. Put a rectangle around the products. 26. How many elements are shown in the above equation? 27. What is the difference between a compound and a molecule?—Give an example of each. 28. How many atoms of Na are on the reactants side? 29. How can you tell ...
Questions for this book (Word format)
... Contrast the locations of the Jupiter-sized planets we have discovered around other stars with the location of Jupiter itself. What is the currently accepted explanation for this difference? Does the lack of known Jupiter-sized planets in Jupiter-like orbits imply that Jupiter is a very unusual plan ...
... Contrast the locations of the Jupiter-sized planets we have discovered around other stars with the location of Jupiter itself. What is the currently accepted explanation for this difference? Does the lack of known Jupiter-sized planets in Jupiter-like orbits imply that Jupiter is a very unusual plan ...
DYNAMICAL STABILITY OF SPHERICAL STARS
... be dynamically unstable. The instability or the oscillations develop on a dynamical time scale, which is defined as τd ≈ σ −1 ≈ (Gρav ) d—1 ...
... be dynamically unstable. The instability or the oscillations develop on a dynamical time scale, which is defined as τd ≈ σ −1 ≈ (Gρav ) d—1 ...