constellation wars
... • Primitive calendars predicting/planning harvest and planting seasons. Ancient cultures knew when certain stars appeared on the horizon before daybreak, it would be the beginning of spring ...
... • Primitive calendars predicting/planning harvest and planting seasons. Ancient cultures knew when certain stars appeared on the horizon before daybreak, it would be the beginning of spring ...
The Sun
... • The energy released in a nuclear reaction corresponds to a slight reduction of mass according to Einstein’s equation E = mc2. • Thermonuclear fusion occurs only at very high temperatures; for example, hydrogen fusion occurs only at temperatures in excess of about 107 K. In the Sun, fusion occurs o ...
... • The energy released in a nuclear reaction corresponds to a slight reduction of mass according to Einstein’s equation E = mc2. • Thermonuclear fusion occurs only at very high temperatures; for example, hydrogen fusion occurs only at temperatures in excess of about 107 K. In the Sun, fusion occurs o ...
Black Holes: Do They Really Exist?
... called ether. Ether was thought to permeates the universe. Knowing Earth’s relative motion with respect to the ether was important for our understanding of our place in the universe. In 1887, Michelson and Morley at Case Western University performed a measurement to determine the flow of ether as th ...
... called ether. Ether was thought to permeates the universe. Knowing Earth’s relative motion with respect to the ether was important for our understanding of our place in the universe. In 1887, Michelson and Morley at Case Western University performed a measurement to determine the flow of ether as th ...
The Night Sky
... passes very close Jupiter in the constellation of Taurus, appearing no more than one degree below Jupiter at 11 p.m. on this date. Some have speculated that such a close conjunction between the moon and Jupiter in 4 BCE was the “star of Bethlehem” reported in the Bible. Mars continues to lose “celes ...
... passes very close Jupiter in the constellation of Taurus, appearing no more than one degree below Jupiter at 11 p.m. on this date. Some have speculated that such a close conjunction between the moon and Jupiter in 4 BCE was the “star of Bethlehem” reported in the Bible. Mars continues to lose “celes ...
Eratosthenes - robertnowlan.com - A Chronicle of Mathematical
... Circumference = 5000 x 360/7.2 = 250,000 stadia. Using the Egyptian stadia of about 173.6 yards, Eratosthenes’ result is 24,662 miles, which is very close to the actual circumference of the earth, as it was measured centuries later. Eratosthenes was not the only Greek who attempted to measure the ci ...
... Circumference = 5000 x 360/7.2 = 250,000 stadia. Using the Egyptian stadia of about 173.6 yards, Eratosthenes’ result is 24,662 miles, which is very close to the actual circumference of the earth, as it was measured centuries later. Eratosthenes was not the only Greek who attempted to measure the ci ...
C:\Documents and Settings\Administrator\Desktop\Lecture 15.wpd
... The Central Problem in astronomy is distance. What we see is basically a twodimensional picture of the sky. To interpret many pieces of information available to the astronomer we need to know how far away a star or galaxy is. Example: If you look at the sky, Sirius is brighter than Betelgeuse. But B ...
... The Central Problem in astronomy is distance. What we see is basically a twodimensional picture of the sky. To interpret many pieces of information available to the astronomer we need to know how far away a star or galaxy is. Example: If you look at the sky, Sirius is brighter than Betelgeuse. But B ...
Homework #2 Solutions Astronomy 10, Section 2 due: Monday
... No, the celestial poles are the extension of the Earthʼs rotation axis out into space. If the Earth did not rotate, it would have no rotation axis. Likewise, the celestial equator is the Earthʼs equator projected out into space. THe Earthʼs equator is the plane perpendicular to the rotation axis. (2 ...
... No, the celestial poles are the extension of the Earthʼs rotation axis out into space. If the Earth did not rotate, it would have no rotation axis. Likewise, the celestial equator is the Earthʼs equator projected out into space. THe Earthʼs equator is the plane perpendicular to the rotation axis. (2 ...
MOVEMENT OF THE SUN ON THE SKY
... Explain the essence of the laws to your 7-year old niece who is smart and knows that planets go around the Sun, but who doesn't know what focus or period or ellipse mean Grading: 0p No answer, completely misunderstood, or clearly no effort. 1p The answer contains 1-2 of the following ideas (see belo ...
... Explain the essence of the laws to your 7-year old niece who is smart and knows that planets go around the Sun, but who doesn't know what focus or period or ellipse mean Grading: 0p No answer, completely misunderstood, or clearly no effort. 1p The answer contains 1-2 of the following ideas (see belo ...
Chapter 21 Special Relativity 21.1 Time Dilation/Length Contraction Homework # 167
... 05. Two spacecraft, A and B, pass each other moving at 0.43c relative to each other. Spacecraft A measures the length of its own ship to be 220 m and that of spacecraft B to be 167 m. What will be the length of Spacecraft __________ as measured by spacecraft B? a.) A b.) B 06. Alpha Centauri is a st ...
... 05. Two spacecraft, A and B, pass each other moving at 0.43c relative to each other. Spacecraft A measures the length of its own ship to be 220 m and that of spacecraft B to be 167 m. What will be the length of Spacecraft __________ as measured by spacecraft B? a.) A b.) B 06. Alpha Centauri is a st ...
2. Stellar Physics
... • planets are not stars - no nuclear fusion • objects in which release of gravitational potential energy is always greater than fusion are not stars either - these are called brown dwarfs Distinction between brown dwarfs and planets is less clear, most people reserve `planet’ to mean very low mass b ...
... • planets are not stars - no nuclear fusion • objects in which release of gravitational potential energy is always greater than fusion are not stars either - these are called brown dwarfs Distinction between brown dwarfs and planets is less clear, most people reserve `planet’ to mean very low mass b ...
Weighing a Black Hole
... An arcsecond is 1/3600th of a degree. Recall the full moon is about half a degree in the night sky or ~1800 arcseconds. Note that the entire area of observation is about one square arcsecond. Angles for Distances? Astronomers like to measure objects in terms of angular scale (most often very small a ...
... An arcsecond is 1/3600th of a degree. Recall the full moon is about half a degree in the night sky or ~1800 arcseconds. Note that the entire area of observation is about one square arcsecond. Angles for Distances? Astronomers like to measure objects in terms of angular scale (most often very small a ...
The Solar System
... From 1930 to 2006, Pluto was considered the ninth planet. Scientists discovered other large objects in the Kuiper (rhymes with hyper) belt beyond Neptune’s orbit. Some scientists wanted to consider these objects planets as well. Other scientists argued that Pluto and these newly discovered objects w ...
... From 1930 to 2006, Pluto was considered the ninth planet. Scientists discovered other large objects in the Kuiper (rhymes with hyper) belt beyond Neptune’s orbit. Some scientists wanted to consider these objects planets as well. Other scientists argued that Pluto and these newly discovered objects w ...
Sample Math problems
... a) 3 million km b) 3 km c) 30 km d) 300 million km e) 3,000 km 5) [FIXED] When my cat and I are in the same reference frame, I measure its tail to be 13 inches long. The other day my cat saw another cat outside of the window and flew past me at 0.75c. How long did I measure its tail to be as it flew ...
... a) 3 million km b) 3 km c) 30 km d) 300 million km e) 3,000 km 5) [FIXED] When my cat and I are in the same reference frame, I measure its tail to be 13 inches long. The other day my cat saw another cat outside of the window and flew past me at 0.75c. How long did I measure its tail to be as it flew ...
Outline of Lecture on Copernican Revolution: 5b: So, what was
... involved only UNIFORM circular motion (around the epicycle and of the epicycle around the earth), while Ptolemy needed to have non-uniform motion of his epicycles around the earth. But this was a detail with an appeal mainly for experts rather than “the person on the street” at the time. Copernicus’ ...
... involved only UNIFORM circular motion (around the epicycle and of the epicycle around the earth), while Ptolemy needed to have non-uniform motion of his epicycles around the earth. But this was a detail with an appeal mainly for experts rather than “the person on the street” at the time. Copernicus’ ...
Return both exam and scantron sheet when you
... (b) Earth. (c) Venus. (d) Mercury. 72. The tidal force on the Moon exerted by the Earth is greater than the tidal force on the Earth exerted by the Moon. (a) True. (b) False. 73. Which of these planets has the highest atmospheric pressure at the Surface? (a) Mercury. (b) Venus. (c) Earth. (d) Mars. ...
... (b) Earth. (c) Venus. (d) Mercury. 72. The tidal force on the Moon exerted by the Earth is greater than the tidal force on the Earth exerted by the Moon. (a) True. (b) False. 73. Which of these planets has the highest atmospheric pressure at the Surface? (a) Mercury. (b) Venus. (c) Earth. (d) Mars. ...
... Also, recall that it had 6o of westward proper motion during that time – more than is usual, suggesting other unseen events. As I write the flaring in AR11899 seems to have waned – but I’ll be keeping one eye on it when viewing in H-alpha, just in case! Note how big and dark it is on the Sun’s disc ( ...
Origin of Mountains and Primary Initiation of Submarine Canyons
... Since the first hypothesis about the origin of the Sun and the planets was advanced in the latter half of the 18th Century by Immanuel Kant and modified later by Pierre-Simon de Laplace, various ideas have been put forward. Generally, concepts of planetary formation fall into one of two categories t ...
... Since the first hypothesis about the origin of the Sun and the planets was advanced in the latter half of the 18th Century by Immanuel Kant and modified later by Pierre-Simon de Laplace, various ideas have been put forward. Generally, concepts of planetary formation fall into one of two categories t ...
astronomy 161 - Ohio State Astronomy
... Objects near the celestial equator move east to west when above the horizon (“rising” in east, “setting” in west). What causes these circular motions? ...
... Objects near the celestial equator move east to west when above the horizon (“rising” in east, “setting” in west). What causes these circular motions? ...