Apparent brightness Study guides, Class notes & Summaries

What were the early ideas of how the Sun shines? Why were these ideas incorrect? Why does the Sun shine? - Answer-Chemical burning was what humans thought made the sun shine. However, if this was true- the sun would be like a campfire that would need a fuel source and to be "fed" periodically. The Sun shines due to nuclear fusion Be able to name the Sun's layers from inside to outside and be able to know the importance of each layer (e.g. what type of light does the chromosphere emit?) -...

To get started, click on the blue Cepheids link on the main screen of the Interactive Figure. The Interactive Figure (in red) shows a graph of the Cepheid period-luminosity relation. This graph indicates that __________. - Cepheids with longer periods have higher luminosities A Cepheid with a period of 30 days has an average luminosity that is about __________ times the luminosity of the Sun. - 10,000 Click on the blue "Cepheid" label, then click the label on the bottom of the Intera...

PHSC 121 Exam Questions with All Correct Answers Why are most of the constellations that were invented in modern times composed of faint stars or located in the southern sky? - Answer-Faint stars or stars in the southern sky were not visible to early astronomers observing from northern latitudes How does the Greek letter designation of a star give you clues both to its location and its apparent brightness? - Answer-The brightest star in a constellation is usually designated as Alpha, the ...

Vocabulary: absolute brightness, absorption spectrum, apparent brightness, Big Bang theory, blueshift, Cepheid variable, Doppler shift, Hubble constant, Hubble’s law, luminosity, megaparsec, period, redshift, spectrograph

The nature of a star can be best determined from its ____________. - ANSWER-Spectrum A light year is the distance light travels in a _________. - ANSWER-Year The ________________ of a star is its brightness as it appears to an observer on Earth. - ANSWER-Apparent magnitude The following heavenly body is classified as a star. - ANSWER-The Sun The galaxy in which Earth and our known planets exist is _____________. - ANSWER-The Milky Way The Milky Way takes on the shape of a _______....

1) Approximately, what basic composition are all stars born with?B) three -quarters hydrogen, one -quarter helium, no more than 2 percent heavier elements 2) Since all stars begin their lives with the same basic composition, what characteristic most determines how they will differ?D) mass they are formed with 3) What are the standard units for luminosity?A) watts 4) A star's luminosity is theE) total amount of light that the star radiates each second. 5) What are the standard units for ...

Astro 7n unit 3 quizzesWhat is the general result of the proton proton chain - correct answer 4 H -> He + energy + other products The corona of the sun - correct answer is visible during a solar eclipse In the Convective zone of the sun - correct answer columns of hot gas rise, cool, and descend What part of the sun do we typically see? - correct answer photosphere In nuclear fusion, energy is produced because: - correct answer the mass of the reacting chemicals is larger than tha...

What are the characteristics of disk stars (yellow) of the Milky Way Galaxy? - High mass stars, the Sun, youngest stars, and stars that all orbit in nearly the same plane What are the characteristics of halo stars (green) of the Milky Way Galaxy? - Globular clusters, oldest stars, stars whose orbits can be inclined at any angle, and stars with smallest abundance of heavy elements. What are the characteristics of spiral galaxies? - They contain abundant clouds of cool gas and dust, are rare...

PHSC 102 Final Bushnell MSU 2024 Exam Questions with Correct Answers How long does the sunspot cycle last, on average? - Answer -about 11 years The vibrations of the Sun reveal information about - Answer -the interior structure of the sun True or False? The most abundant element in the Sun is helium. - Answer -False What is it about the Sun's corona that astronomers don't understand? - Answer -The corona is much hotter than layers of the Sun that are closer to the solar interior. ...

1) The rotation curve of the Milky Way suggests that the majority of the mass of the Milky Way lies farther out than the Sun's orbit. A) True B) False 1) 2) Which of the following best describes the evolutionary track followed on the H-R diagram for the most massive stars (before the star undergoes a Type II supernova)? A) horizontally right, then forms a clockwise loop B) horizontally right, diagonally to lower left, then horizontally right C) diagonally to lower right, then vertical,...