The Milky Way galaxy
... Your book gives estimates of the mass of the Galaxy from 1 to 4 X 1011 solar masses. A more recent determination of the mass of the Galaxy is even larger, 1.5-4.0 X 1012 solar masses. This is on the basis of stars of known absolute magnitude called horizontal branch stars. An analysis of 1000 of th ...
... Your book gives estimates of the mass of the Galaxy from 1 to 4 X 1011 solar masses. A more recent determination of the mass of the Galaxy is even larger, 1.5-4.0 X 1012 solar masses. This is on the basis of stars of known absolute magnitude called horizontal branch stars. An analysis of 1000 of th ...
Luminosity Classes
... days. Their period is related to their luminosity so they make good “Standard Candles” and are used to find stellar distances… Polaris is one! ...
... days. Their period is related to their luminosity so they make good “Standard Candles” and are used to find stellar distances… Polaris is one! ...
Notes- Stars
... Life Cycle of Stars • The matter inside the star will be compressed so tightly that its atoms are compacted into a dense shell of neutrons. If the remaining mass of the star is more than about three times that of the Sun, it will collapse so completely that it will literally disappear from the univ ...
... Life Cycle of Stars • The matter inside the star will be compressed so tightly that its atoms are compacted into a dense shell of neutrons. If the remaining mass of the star is more than about three times that of the Sun, it will collapse so completely that it will literally disappear from the univ ...
1: The scientific name for my field is astronomy
... 3: None of the chapters in the Science Interactions brown book are based on Astronomy. 4: Chapters 19-20 in the Science Interactions blue book are based on Astronomy. 5: Astronomers study anything outside the Earth’s exosphere, where the atmosphere of the Earth disappears. There are many types of As ...
... 3: None of the chapters in the Science Interactions brown book are based on Astronomy. 4: Chapters 19-20 in the Science Interactions blue book are based on Astronomy. 5: Astronomers study anything outside the Earth’s exosphere, where the atmosphere of the Earth disappears. There are many types of As ...
Science Quiz
... The Sun-How do prominences and solar flares (CME’s) affect Earth? What protects Earth from CME’s? ...
... The Sun-How do prominences and solar flares (CME’s) affect Earth? What protects Earth from CME’s? ...
chapter_5_lecture_notes
... Hot, bright, gaseous ball that consists mainly of hydrogen and helium Surface temperature of about 5500 degrees ...
... Hot, bright, gaseous ball that consists mainly of hydrogen and helium Surface temperature of about 5500 degrees ...
Exploring Space
... million K, pressure is so great that nuclear fusion occurs- a star is born Heat from fusion of hydrogen is released When balance is maintained from inward pressure (gravity) and outward pressure (heat) the Main-Sequence stage is ...
... million K, pressure is so great that nuclear fusion occurs- a star is born Heat from fusion of hydrogen is released When balance is maintained from inward pressure (gravity) and outward pressure (heat) the Main-Sequence stage is ...
A Brief History of Planetary Science
... Photometry We want to get an accurate quantitative measure of brightness Our system is composed of two things: ...
... Photometry We want to get an accurate quantitative measure of brightness Our system is composed of two things: ...
The Solar System Worksheet - Laureate International College
... < outermost layer of the Sun < extends beyond chromosphere for millions of kilometres < extremely powerful solar flare < causes vivid & active auroras (& can damage satellites) ...
... < outermost layer of the Sun < extends beyond chromosphere for millions of kilometres < extremely powerful solar flare < causes vivid & active auroras (& can damage satellites) ...
What Is a Light
... (40,000,000,000,000) kilometers from Earth. Such a large number is difficult to understand and use in calculations. For this reason, astronomers use a different unit of measurement when they talk about distances between stars. ...
... (40,000,000,000,000) kilometers from Earth. Such a large number is difficult to understand and use in calculations. For this reason, astronomers use a different unit of measurement when they talk about distances between stars. ...
Stars
... • The matter inside the star will be compressed so tightly that its atoms are compacted into a dense shell of neutrons. If the remaining mass of the star is more than about three times that of the Sun, it will collapse so completely that it will literally disappear from the universe. What is left be ...
... • The matter inside the star will be compressed so tightly that its atoms are compacted into a dense shell of neutrons. If the remaining mass of the star is more than about three times that of the Sun, it will collapse so completely that it will literally disappear from the universe. What is left be ...
Lesson 16.3
... From Earth, the stars in a constellation may look close together. They may look this way because they are in the same direction from Earth. But the stars might actually be very far apart. People in different parts of the world see different constellations. Earth can be divided into two parts along t ...
... From Earth, the stars in a constellation may look close together. They may look this way because they are in the same direction from Earth. But the stars might actually be very far apart. People in different parts of the world see different constellations. Earth can be divided into two parts along t ...
3. Measuring Distances and Magnitudes
... Telescope) have improved parallax accuracy to 0.001” within a few years. Prior to 1990, less than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 1012 stars in our Galaxy. Space observations made by the European Space Agency with the Hipparcos mission (1989 ...
... Telescope) have improved parallax accuracy to 0.001” within a few years. Prior to 1990, less than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 1012 stars in our Galaxy. Space observations made by the European Space Agency with the Hipparcos mission (1989 ...
What is a Scientist? - Cockeysville Middle School
... Drill: 1. Take out yesterday’s lab sheet. 2. Get a new Vocabulary Sheet from the SET. 3. Check your definitions. ...
... Drill: 1. Take out yesterday’s lab sheet. 2. Get a new Vocabulary Sheet from the SET. 3. Check your definitions. ...
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. ...
What are stars?
... The H-R Diagram What type of star has a temperature of 3,000 K and a luminosity of 103? ________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ...
... The H-R Diagram What type of star has a temperature of 3,000 K and a luminosity of 103? ________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ...
Chapter 8, Lesson 4, 2nd Packet, pdf
... The H-R Diagram What type of star has a temperature of 3,000 K and a luminosity of 103? ________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ...
... The H-R Diagram What type of star has a temperature of 3,000 K and a luminosity of 103? ________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ...
Ch. 5 The Universe and Solar System
... • Contain a large amount of interstellar gas and dust which indicates young star development. • Only a small percentage of all known galaxies are irregular galaxies. ...
... • Contain a large amount of interstellar gas and dust which indicates young star development. • Only a small percentage of all known galaxies are irregular galaxies. ...
Astronomy.Practice.Quiz3
... 13. After the red giant phase, the next phase for a medium mass star is: a. nova b. planetary nebula c. white dwarf 14. This is how bright a star appears on Earth. a. apparent magnitude b. absolute magnitude ...
... 13. After the red giant phase, the next phase for a medium mass star is: a. nova b. planetary nebula c. white dwarf 14. This is how bright a star appears on Earth. a. apparent magnitude b. absolute magnitude ...
Type Ia Supernovae as distance indicators
... Type Ia Supernovae: Distance Indicators I •What makes type Ia supernovae good distance indicators? ...
... Type Ia Supernovae: Distance Indicators I •What makes type Ia supernovae good distance indicators? ...
Phys 100 – Astronomy (Dr. Ilias Fernini) Review Questions for
... large amounts of gas and dust but very few stars. large amounts of gas, dust, and stars. a single star and planets. thousands of super clusters. ...
... large amounts of gas and dust but very few stars. large amounts of gas, dust, and stars. a single star and planets. thousands of super clusters. ...
star_temperatures
... Stellar brightness differences as a tool rather than as a liability • If one can somehow determine that 2 stars are identical, then their relative brightnesses translate to relative distances • Example: the Sun and alpha Centauri – spectra look very similar => temperatures, radii almost identical ( ...
... Stellar brightness differences as a tool rather than as a liability • If one can somehow determine that 2 stars are identical, then their relative brightnesses translate to relative distances • Example: the Sun and alpha Centauri – spectra look very similar => temperatures, radii almost identical ( ...
Diapositiva 1
... Near the center of this sharp cosmic portrait, at the heart of the Orion Nebula, are four hot, massive starsknown as the Trapezium. Gathered within a region about 1.5 light-years in radius, they dominate the core of the dense Orion Nebula Star Cluster. Ultraviolet ionizing radiation from the Trapez ...
... Near the center of this sharp cosmic portrait, at the heart of the Orion Nebula, are four hot, massive starsknown as the Trapezium. Gathered within a region about 1.5 light-years in radius, they dominate the core of the dense Orion Nebula Star Cluster. Ultraviolet ionizing radiation from the Trapez ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.