Chapter 24 Flashcards
Who developed a system for naming stars that used Greek and Latin?
Bayer
What are used for giving the precise location of a star?
Declination and right ascension
In apparent magnitude, is the lower or higher number brighter?
Lower
Does apparent magnitude depend on the temperature of the star?
NO
According to Genesis 1:14, why did God create the stars?
For signs and seasons
What do cepheid variables do?
Make it easier to estimate the size of the universe
What is a light year?
The distance light travels in a year
What is used to estimate the distance to a dim, distant star?
Red shift
What makes up the bulk of elements in most stars?
Hydrogen and helium
What are used to classify luminosity?
Roman numerals
What are used as the axes to plot stars on the H-R diagram?
Temperature and luminosity
What are later stages in the life of a star?
Planetary nebulas, white dwarfs, and neutron stars
What do pulsars and quasars both release?
Radio waves
Do most galaxies have a super nova in the center of it?
NO
Where are protostars found?
In stellar nurseries
How old does the Standard Model of Cosmology say the universe is?
13.5 billion years old
What is the actual brightness of a star called?
Absolute magnitude
What is a star’s real motion a combination of?
Proper and radial motion
Where are main-sequence stars found?
In the diagonal band of the H-R diagram
What is a cloud of gas or dust that can be seen against a background of stars?
Nebula
What Galaxy is our sun in?
Milky Way
What is the study of how the universe began and how it changed over time?
Cosmology
Who wrote an equation for calculating the probability of extraterrestrial life that led to SETI?
Drake
Who created the New General Catalogue listing over 13,000 nebulas and other non-stellar objects?
Dreyer
Who divided stars into six different ranks of magnitude?
Hipparchus
Who developed the relationship between red shift and stellar distance?
Hubble
Who proposed an idea that became the Big Bang Theory?
Lemaitre
Who created an early catalog of non-stellar objects and used Ms to distinguish them?
Messier
Are all asterisms constellations?
NO
Are all constellations asterisms?
YES
Who created the first system for assigning numbers to the magnitude of stars?
Hipparchus
Which is larger: parsec or light year?
Parsec
What would a star that had a diameter 100 times larger than our sun be called?
A supergiant
Does a low-mass star have less mass than our sun?
YES
Do astronomers believe that black holes formed at the beginning of the universe and some remnants of supernovas?
YES
What are most of the stars in our galaxy believed to be?
True binary stars
Are globular clusters and open clusters held together by gravity?
NO
According to the most popular view of what the first stars formed just after the Big Bang the new stars have formed many times since that event?
Stellar evolution
