ASTRO 7N EXAM 2 INTRODUCTION TO
ASTRONOMY MODULE NOTES AND
FUNDAMENTAL SPACE SCIENCE
CONCEPTS 2026 MASTER RESOURCE
◉ What is the name of the slightly cooler layer of the Sun just
outside the photosphere?
Answer: chromosphere
◉ How does a star move on the H-R diagram during the period of
time it is converting hydrogen to helium in its core?
Answer: it remains nearly fixed at a certain point on the main
sequence and does not move on the H-R diagram
◉ If the entire mass of Earth were concentrated in a region the size
of a marble, the resulting object would be:
Answer: a black hole
◉ Which is the smallest object?
Answer: a neutron star
, ◉ A galaxy has an H-alpha emission line observed at a wavelength
10 percent larger than the rest wavelength of H-alpha. What is the
redshift of the galaxy?
Answer: 0.1
◉ What is in this image?
Answer: supernova remnant
◉ Which is most luminous?
Answer: quasar
◉ Which contains the most stars?
Answer: a spiral galaxy
◉ Galaxy A appears twice the angular size of Galaxy B. Assuming the
two galaxies have the same physics size in kiloparsecs, which of the
following is true?
Answer: Galaxy B is 2 times farther away than galaxy A
◉ What fundamental particles make a Helium-3 atom?
Answer: 5 up quarks, 4 down quarks, 2 electrons
ASTRONOMY MODULE NOTES AND
FUNDAMENTAL SPACE SCIENCE
CONCEPTS 2026 MASTER RESOURCE
◉ What is the name of the slightly cooler layer of the Sun just
outside the photosphere?
Answer: chromosphere
◉ How does a star move on the H-R diagram during the period of
time it is converting hydrogen to helium in its core?
Answer: it remains nearly fixed at a certain point on the main
sequence and does not move on the H-R diagram
◉ If the entire mass of Earth were concentrated in a region the size
of a marble, the resulting object would be:
Answer: a black hole
◉ Which is the smallest object?
Answer: a neutron star
, ◉ A galaxy has an H-alpha emission line observed at a wavelength
10 percent larger than the rest wavelength of H-alpha. What is the
redshift of the galaxy?
Answer: 0.1
◉ What is in this image?
Answer: supernova remnant
◉ Which is most luminous?
Answer: quasar
◉ Which contains the most stars?
Answer: a spiral galaxy
◉ Galaxy A appears twice the angular size of Galaxy B. Assuming the
two galaxies have the same physics size in kiloparsecs, which of the
following is true?
Answer: Galaxy B is 2 times farther away than galaxy A
◉ What fundamental particles make a Helium-3 atom?
Answer: 5 up quarks, 4 down quarks, 2 electrons
