Star spectra - Study guides, Class notes & Summaries

How long is the drive (60 mph) from Earth to the nearest star? - correct answer 400 billion hours or 50 million years AU - correct answer astronomical unit (distance from the earth to the sun) T/F: Scientific theory can be tested by observations and proved true - correct answer False; You cannot prove absolute truth, you can only disprove it. T/F: ...

Cygnus x-1 - correct answer A powerful x-ray source that is believed to be a black hole in our galaxy Virgo Cluster - correct answer Nearest large cluster of galaxies to our local group SBb - correct answer assignment given to a galaxy with moderately sized nuclear bulge & moderately wound arms starting from a bar through the central part of the galaxy That of an average city, about 10km - correct answer the diameter of a typical neutron star of 1 solar mass is predicted to be approxima...

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Where on Earth would you be if Polaris (The North Star) was at your zenith? A) North Pole B) Tropic of Cancer C) Arctic Circle D) Equator E) It lies overhead everywhere on Earth. 1) 2) What problem does reflecting telescope adaptive optics correct? A) The light pollution of urban areas B) Defects in the optics of the telescope, such as the original Hubble mirror C) Turbulence in t...

Astronomy 101 Exam Questions and Correct Answers A Grade Which of the following properties can be inferred from the star's orbital period? - Answer-The planet's orbital radius Is it possible to determine the planet's mass from the star's velocity curve? - Answer-Yes, by measuring both the star's orbital period and its change in velocity over the orbit Consider the planet that causes the stellar motion shown in Plot 2 (be sure you have clicked the "Plot 2" button in the lower windo...

Describe the relationship between the frequency, wavelength, and velocity (speed) of a wave. - AnswerThe more times the wave is passing through a point in space = a higher frequency, the higher frequency creates a smaller wavelength, which is why the smallest wave is a gamma wave, it has the highest frequency and the shortest distance between waves, the velocity can be measured in m/s and is composed of frequency and wavelength Calculate any one (frequency, wavelength, or velocity) given the...

Astronomy 1010 Final HW Test Questions With All Correct Answers One of the most important earlier steps in understanding stars was to group them into classes called spectral types that could offer clues as to why they are different from one another. Shown here are spectra of some main-sequence stars. Before stars were very well understood, they were classified into an order that was based on the relative strength of hydrogen absorption lines, marked by arrows the image shown. Look at the ...

Astronomy 1010 Final HW One of the most important earlier steps in understanding stars was to group them into classes called spectral types that could offer clues as to why they are different from one another. Shown here are spectra of some main-sequence stars. Before stars were very well understood, they were classified into an order that was based on the relative strength of hydrogen absorption lines, marked by arrows the image shown. Look at the spectra for stars of different spectral ...

We have learned that the centre of the milky way contains a very massive black hole. We developed this understanding by: - Monitoring the orbital motions of many individual stars in the very central parts of the Milky Way If the sun were to be squashed down small enough to become a black hole, then: - The planets in the solar system would orbit the Sun in unchanged fashion (but would receive no light from it) The first stellar mass black hole identified, Cygnus X-1, was found in 1973. The n...

(EXAM WITH COMPLETE SOLUTIONS) # 3 Review Questions A blackbody glowing with which of the following colors is hottest? Of the following photons, which has the lowest energy? The spectrum of which of the following objecting will show a blueshift? What is a blackbody? ? If stars appear to be like blackbodies, why are they not black? What does it mean to say that a star appears almost like a blackbody What is Wien's law? How could you use it to determine the temperature of a star's surface?...

AEA Quiz Exam2024 Expected Questions and Answers (Verified by Expert) AEA Quiz Exam2024 Expected Questions and Answers (Verified by Expert) AEA Quiz Exam2024 Expected Questions and Answers (Verified by Expert) AEA Quiz 2024 Expected Questions and Answers (Verified by Expert) 1. what do asteroids and comets have in common? ANS most are unchanged since their formation in the solar nebula 2. why do asteroids and comets differ in composition ANS asteroids f...