Physics 161 Homework 1 - Solutions Friday August 26, 2011
... 7. Hubble’s law says that the recessional velocity of distant galaxies is proportional to the distance away, ~v = H0~r, where H0 is the proportionality constant, called the Hubble constant. Show that Hubble’s law does not say that we are in the center of the Universe! (Hint: consider three galaxies ...
... 7. Hubble’s law says that the recessional velocity of distant galaxies is proportional to the distance away, ~v = H0~r, where H0 is the proportionality constant, called the Hubble constant. Show that Hubble’s law does not say that we are in the center of the Universe! (Hint: consider three galaxies ...
A search for planets around intermediate Mass Stars with the Hobby
... Research, Science and Technology of Brown Dwarfs and Exoplanets of the MS. K3-giant HD 240210 is very likely a multiplanet system, though more data will be required to obtain a clear orbital solution. The provisional parameters for one planet that can be fitted for give a 6.9 MJ body in a 501-day, ...
... Research, Science and Technology of Brown Dwarfs and Exoplanets of the MS. K3-giant HD 240210 is very likely a multiplanet system, though more data will be required to obtain a clear orbital solution. The provisional parameters for one planet that can be fitted for give a 6.9 MJ body in a 501-day, ...
Spring and Summer Sky Observer
... the Milky Way, we cannot view the entire structure. However, one side of our galaxy is visible as a starry band across the night sky. Clusters are groups of stars that are together in space. A globular cluster, which may contain millions of stars, is much larger and denser than an open cluster. The ...
... the Milky Way, we cannot view the entire structure. However, one side of our galaxy is visible as a starry band across the night sky. Clusters are groups of stars that are together in space. A globular cluster, which may contain millions of stars, is much larger and denser than an open cluster. The ...
Powers Of Ten
... At this tremendous distance we could see all the Milky Way & other galaxies too... ...
... At this tremendous distance we could see all the Milky Way & other galaxies too... ...
Answers to Final Exam – Study Guide
... 89. On Earth the acceleration due to gravity is 9.8 m/s/s 90. A football shaped collection of millions of stars is called a(n) elliptical galaxy 91. 149.85 cm3 is equal to ____149.85__ mL 92. A rainbow of colors that comes from white light passing through a prism is called a spectrum 93. The formula ...
... 89. On Earth the acceleration due to gravity is 9.8 m/s/s 90. A football shaped collection of millions of stars is called a(n) elliptical galaxy 91. 149.85 cm3 is equal to ____149.85__ mL 92. A rainbow of colors that comes from white light passing through a prism is called a spectrum 93. The formula ...
Observational Data
... perhaps Leo I. We notice that this kind of star formation history is similar to the one of dIrr galaxies. ...
... perhaps Leo I. We notice that this kind of star formation history is similar to the one of dIrr galaxies. ...
Singin` the Black and Blues - GALEX
... at a galaxy a million light years away, they are seeing the galaxy as it looked a million years ago. The light that leaves that galaxy today will have much farther to travel to our eyes than the light that left it a million years ago or even one year ago, because the distance between that galaxy and ...
... at a galaxy a million light years away, they are seeing the galaxy as it looked a million years ago. The light that leaves that galaxy today will have much farther to travel to our eyes than the light that left it a million years ago or even one year ago, because the distance between that galaxy and ...
Objective or GLE: 6.1.A.a: Classify celestial bodies in the solar
... Most of these extraterrestrial rocks are small in size. However, extremely large ones have been noted, such as the asteroid Ceres, which is approximately 930 kilometers in diameter. There are two other main groups of asteroids in our solar system. One of these groups is called the Near Earth Asteroi ...
... Most of these extraterrestrial rocks are small in size. However, extremely large ones have been noted, such as the asteroid Ceres, which is approximately 930 kilometers in diameter. There are two other main groups of asteroids in our solar system. One of these groups is called the Near Earth Asteroi ...
Article - The 10 weirdest physics facts
... They’re very dark, sure, but they aren’t black. They glow, slightly, giving off light across the whole spectrum, including visible light. This radiation is called “Hawking radiation”, after the former Lucasian Professor of Mathematics at Cambridge University Stephen Hawking, who first proposed its e ...
... They’re very dark, sure, but they aren’t black. They glow, slightly, giving off light across the whole spectrum, including visible light. This radiation is called “Hawking radiation”, after the former Lucasian Professor of Mathematics at Cambridge University Stephen Hawking, who first proposed its e ...
Planets & Stars
... A star’s brightness depends on its size and how hot it is. Larger and hotter stars are brighter than smaller and cooler stars. Brighter stars send out more light energy. A dim star that is close to Earth can appear brighter than a more distant star that is actually very bright. ...
... A star’s brightness depends on its size and how hot it is. Larger and hotter stars are brighter than smaller and cooler stars. Brighter stars send out more light energy. A dim star that is close to Earth can appear brighter than a more distant star that is actually very bright. ...
Announcements
... • Suppose it was discovered that the Hubble constant is twice the value that it is currently thought to be, how would this change our estimate of the age of the Universe? • Compare a flat universe with a positively curved universe as to whether they are finite, bounded, and have a center. ...
... • Suppose it was discovered that the Hubble constant is twice the value that it is currently thought to be, how would this change our estimate of the age of the Universe? • Compare a flat universe with a positively curved universe as to whether they are finite, bounded, and have a center. ...
Lecture3
... • Lines of ions (= ionized element – meaning some electrons missing) (e.g., He II, Ca II, Fe II) found in hotter stars than lines from atoms (= neutral = not ionized) of the same element (e.g., He I, Ca I, Fe I) because electrons in ions of the same element more tightly bound, since they have less ...
... • Lines of ions (= ionized element – meaning some electrons missing) (e.g., He II, Ca II, Fe II) found in hotter stars than lines from atoms (= neutral = not ionized) of the same element (e.g., He I, Ca I, Fe I) because electrons in ions of the same element more tightly bound, since they have less ...
Specific Word Instruction Possible Sentences
... Read the Selection Studying the Sky stronomy is the study of the planets, stars, and galaxies. People have been watching the movement of the sun, moon, planets, and stars since ancient times. So astronomy is a very, very old science. From early times, people tried to make models of the universe. For ...
... Read the Selection Studying the Sky stronomy is the study of the planets, stars, and galaxies. People have been watching the movement of the sun, moon, planets, and stars since ancient times. So astronomy is a very, very old science. From early times, people tried to make models of the universe. For ...
Homework 5 (stellar properties)
... 2. (2 pts.) What does luminosity measure that is different from what absolute visual magnitude measures? ...
... 2. (2 pts.) What does luminosity measure that is different from what absolute visual magnitude measures? ...
Transcript - the Cassiopeia Project
... It was during the early decades of the 19th century that the structure of atoms was coming into focus. It was known for example that a hydrogen atom contained one proton and one electron. But the scientists of the time could think of no stable arrangement of the two particles. It was known that prot ...
... It was during the early decades of the 19th century that the structure of atoms was coming into focus. It was known for example that a hydrogen atom contained one proton and one electron. But the scientists of the time could think of no stable arrangement of the two particles. It was known that prot ...
Unit 5
... Earth revolves around the Sun in and year and rotates on its axis in a 24-hour day. They have related this rotation of Earth to day and night while recognizing that the movements of the sun, moon, and stars are connected. SC.5.E.5.1: (DOK 1) Recognize that a galaxy consists of gas, dust, and many st ...
... Earth revolves around the Sun in and year and rotates on its axis in a 24-hour day. They have related this rotation of Earth to day and night while recognizing that the movements of the sun, moon, and stars are connected. SC.5.E.5.1: (DOK 1) Recognize that a galaxy consists of gas, dust, and many st ...
Distance measurement in astronomy
... Cepheid variables are one particular type of variable star (one whose brightness changes with time) called after delta Cephei, the first star of this type to be observed. The variation in brightness of this star was discovered by John Goodricke in 1784. Goodricke lived in York and was a promising yo ...
... Cepheid variables are one particular type of variable star (one whose brightness changes with time) called after delta Cephei, the first star of this type to be observed. The variation in brightness of this star was discovered by John Goodricke in 1784. Goodricke lived in York and was a promising yo ...
Stellar Evolution
... so little mass that no fusion can occur. Therefore they are never main-sequence stars. It glows with infrared light generated from its gravitational contraction like Jupiter does. They don’t “evolve” but stay brown dwarfs and slowly fade over 100s of billions of years ...
... so little mass that no fusion can occur. Therefore they are never main-sequence stars. It glows with infrared light generated from its gravitational contraction like Jupiter does. They don’t “evolve” but stay brown dwarfs and slowly fade over 100s of billions of years ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.