Astronomy 401 Lecture 1 Overview of the Universe 1 Class overview
... independent of r. The time H0−1 is called the Hubble time, and is an approximate timescale for the age of the Universe (it is only equal to the age of the Universe if galaxy velocities were the same at all times in the past). H0−1 = 13.8 Gyr. Let’s use this to return to Olbers’ paradox. We saw above ...
... independent of r. The time H0−1 is called the Hubble time, and is an approximate timescale for the age of the Universe (it is only equal to the age of the Universe if galaxy velocities were the same at all times in the past). H0−1 = 13.8 Gyr. Let’s use this to return to Olbers’ paradox. We saw above ...
Light-years
... to form a dense object with gravity so strong that light cannot escape it. a. b. c. d. ...
... to form a dense object with gravity so strong that light cannot escape it. a. b. c. d. ...
The Spring Night Sky – March, April and May All data sourced from
... Jupiter is almost at opposition this month. Saturn is still a morning object. Uranus is in solar conjunction and not visible this month. The Stars at 10pm BST North – Ursa Minor, Cepheus, Cassiopeia and Perseus are nicely placed East – Hercules and Bootes are nicely placed South – Leo and Virgo are ...
... Jupiter is almost at opposition this month. Saturn is still a morning object. Uranus is in solar conjunction and not visible this month. The Stars at 10pm BST North – Ursa Minor, Cepheus, Cassiopeia and Perseus are nicely placed East – Hercules and Bootes are nicely placed South – Leo and Virgo are ...
The magnitude scale
... times fainter again, i.e. 10,000 times fainter than one at the naked eye limit, and so on. ...
... times fainter again, i.e. 10,000 times fainter than one at the naked eye limit, and so on. ...
What The Star of Bethlehem Was Not
... This theory has been championed, in various guises, by Patrick Moore. He suggests that the magi saw a bright meteor, or possibly two bright meteors – one to tell them when Jesus was born, the other to tell them that they had arrived at their destination. An alternative which he has proposed is a "Cy ...
... This theory has been championed, in various guises, by Patrick Moore. He suggests that the magi saw a bright meteor, or possibly two bright meteors – one to tell them when Jesus was born, the other to tell them that they had arrived at their destination. An alternative which he has proposed is a "Cy ...
S T A R S
... extends out to about 200AU. These are more than another asteroid belt as is between Mars and Jupiter. EKOs have a combined mass in the order of 300 times the total mass of all asteroids. They have a very diverse range of colours, surfaces, sizes, surface activities and some possess satellites and at ...
... extends out to about 200AU. These are more than another asteroid belt as is between Mars and Jupiter. EKOs have a combined mass in the order of 300 times the total mass of all asteroids. They have a very diverse range of colours, surfaces, sizes, surface activities and some possess satellites and at ...
Astronomy - Test 3
... E) Although such objects could occur, they would be so rare that we ignore them 26. Which of the following was not a method for making black holes that was discussed? A) Very high mass star supernova B) White dwarf supernova C) Accretion of matter onto a neutron star D) Merger of neutron stars E) Ac ...
... E) Although such objects could occur, they would be so rare that we ignore them 26. Which of the following was not a method for making black holes that was discussed? A) Very high mass star supernova B) White dwarf supernova C) Accretion of matter onto a neutron star D) Merger of neutron stars E) Ac ...
Question 1
... Question 1 The location of the Galactic center was identified early in the 20th century using a) supernova remnants. b) white dwarf stars in the spiral arms. c) red giant variable stars in globular clusters. d) bright O and B stars in open clusters. e) X-ray sources. Explanation: Harlow Shapley use ...
... Question 1 The location of the Galactic center was identified early in the 20th century using a) supernova remnants. b) white dwarf stars in the spiral arms. c) red giant variable stars in globular clusters. d) bright O and B stars in open clusters. e) X-ray sources. Explanation: Harlow Shapley use ...
Galaxy clusters - University of Iowa Astrophysics
... source, we can figure out the total mass in the lens. This provides an independent confirmation of dark matter. • A lense can act as a huge telescope. The deepest images of the most distant galaxies are obtained with clusters acting as gravitational lenses. ...
... source, we can figure out the total mass in the lens. This provides an independent confirmation of dark matter. • A lense can act as a huge telescope. The deepest images of the most distant galaxies are obtained with clusters acting as gravitational lenses. ...
Unit 3 - Section 8.9 Life of Stars
... If the remnants of the explosion are between1.4 to 3 times as massive as our Sun, it will become a Neutron Star. After the Supernova explosion, the centre of the star collapses so that protons and electrons combine to form neutrons (...thus, Neutron Star). A Neutron Star is very, very dense (e.g., ...
... If the remnants of the explosion are between1.4 to 3 times as massive as our Sun, it will become a Neutron Star. After the Supernova explosion, the centre of the star collapses so that protons and electrons combine to form neutrons (...thus, Neutron Star). A Neutron Star is very, very dense (e.g., ...
Jeopardy - Cloudfront.net
... a. absorption spectrum of elements to the emission spectra of a star b. continuous spectrum of elements to the emission spectra of a star c. emission spectrum of elements to the absorption spectra of a star d. emission spectrum of elements to continuous spectra of a star ...
... a. absorption spectrum of elements to the emission spectra of a star b. continuous spectrum of elements to the emission spectra of a star c. emission spectrum of elements to the absorption spectra of a star d. emission spectrum of elements to continuous spectra of a star ...
Astro history 1
... • Why are we here (not clear on that one either…?) • Where are we? • Humans have been working on that one for a long time! ...
... • Why are we here (not clear on that one either…?) • Where are we? • Humans have been working on that one for a long time! ...
Multiple Choice, continued Stars, Galaxies, and the Universe
... Today, we know that Copernicus was right: the stars are very far from Earth. In fact, stars are so distant that a new unit of length—the light-year—was created to measure their distance. A light-year is a unit of length equal to the distance that light travels through space in 1 year. Because the sp ...
... Today, we know that Copernicus was right: the stars are very far from Earth. In fact, stars are so distant that a new unit of length—the light-year—was created to measure their distance. A light-year is a unit of length equal to the distance that light travels through space in 1 year. Because the sp ...
HABITABLE PLANETS For every star with planets, how many of
... explode as supernovae, scattering newly-formed elements throughout the Galaxy. 14N---comes from ``CNO cycle" (need C+O to start it). C and O are used as catalysts for H→He, but some C+O are turned into 14N. So 14N can only be made in 2nd generation (or later) stars. → Implication for SETI: reject ol ...
... explode as supernovae, scattering newly-formed elements throughout the Galaxy. 14N---comes from ``CNO cycle" (need C+O to start it). C and O are used as catalysts for H→He, but some C+O are turned into 14N. So 14N can only be made in 2nd generation (or later) stars. → Implication for SETI: reject ol ...
Test 3, February 7, 2007 - Brock physics
... (a) Protostar, main-sequence, yellow giant, red giant, neutron star or a black hole. (b) Protostar, main-sequence, red giant, yellow giant, red giant, white dwarf. 31. Which is the heaviest element that can be obtained through nuclear fusion of the lighter ones with a release of energy? (a) Gold. (b ...
... (a) Protostar, main-sequence, yellow giant, red giant, neutron star or a black hole. (b) Protostar, main-sequence, red giant, yellow giant, red giant, white dwarf. 31. Which is the heaviest element that can be obtained through nuclear fusion of the lighter ones with a release of energy? (a) Gold. (b ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.