ASTRO 5 EXAM UPDATED QUESTIONS WITH
100% VERIFIED ANSWERS 2025 EDITION
What is the definition of a star's habitable zone? - ANSWER the range of
distances from the star where liquid water can be stable on the surface of a
suitable planet
Over time, as they age, the habitable zone of stars like our Sun - ANSWER
move outward
Which of the following statements regarding the determination of surface
habitability and subsurface habitability of a planet is correct? - ANSWER
surface habitability can be determined remotely by studying reflected starlight
from a planet, while determining subsurface habitability would require a robotic
space probe
Most of the carbon dioxide on the Earth - ANSWER is locked up in carbonate
rocks in its crust or is dissolved in the oceans
If the Earth were to be moved to where Venus is today, - ANSWER the oceans
would evaporate and carbonate rocks would decompose producing a runaway
greenhouse effect much more severe than the one that exists on Venus today
Stars much more luminous than the Sun have - ANSWER wider habitable
zones, increasing the odds of finding habitable planets but lifetimes too short for
life to appear
Compared to today, in the future, the Sun's habitable zone will be - ANSWER
wider and farther from the Sun
The recent gradual rise in the Earth's average surface temperature is commonly
referred to as - ANSWER global warming
, Evidence that the recent rise in carbon dioxide concentration is due to human
activity and not natural factors comes from - ANSWER -estimates of changes
in the amount of carbon dioxide from natural sources such as volcanoes and the
oceans can account for no more than about 1% of the rise in the atmospheric
concentration
-the ratio of carbon isotopes is consistent with the increase in carbon dioxide
levels coming primarily from the burning of fossil fuels
-the amount of the rise in the atmospheric concentration tracks almost perfectly
with the amount of carbon dioxide being released by industry
Measurements of carbon dioxide concentrations in our atmosphere over the past
800,000 years show - ANSWER a direct correlation with global surface
temperatures
As global warming raises the moisture content in our atmosphere, storms will -
ANSWER become more numerous and severe
Climate models predict that due to the melting of the polar ice caps, sea levels
by the end of this century - ANSWER may rise by several meters
A pattern of dark lines on a continuous background is referred to as -
ANSWER an absorption line spectrum
Measuring where the thermal radiation spectrum of a dense object peaks allows
us to determine its - ANSWER temperature
The main way astronomers determine the physical and chemical properties of
an object in the distant universe is through - ANSWER spectroscopy
Recall that stars are classified with types from the spectra sequence
OBAFGKM. In general, an ordinary (hydrogen-fusing, or main-sequence) star
of spectral type A is ________ than a star of spectral type K. - ANSWER
hotter, more luminous, and more massive
Consider a star that is less massive than the Sun. For a planet to receive the
same intensity of light from this star as Earth receives from the Sun, the planet
100% VERIFIED ANSWERS 2025 EDITION
What is the definition of a star's habitable zone? - ANSWER the range of
distances from the star where liquid water can be stable on the surface of a
suitable planet
Over time, as they age, the habitable zone of stars like our Sun - ANSWER
move outward
Which of the following statements regarding the determination of surface
habitability and subsurface habitability of a planet is correct? - ANSWER
surface habitability can be determined remotely by studying reflected starlight
from a planet, while determining subsurface habitability would require a robotic
space probe
Most of the carbon dioxide on the Earth - ANSWER is locked up in carbonate
rocks in its crust or is dissolved in the oceans
If the Earth were to be moved to where Venus is today, - ANSWER the oceans
would evaporate and carbonate rocks would decompose producing a runaway
greenhouse effect much more severe than the one that exists on Venus today
Stars much more luminous than the Sun have - ANSWER wider habitable
zones, increasing the odds of finding habitable planets but lifetimes too short for
life to appear
Compared to today, in the future, the Sun's habitable zone will be - ANSWER
wider and farther from the Sun
The recent gradual rise in the Earth's average surface temperature is commonly
referred to as - ANSWER global warming
, Evidence that the recent rise in carbon dioxide concentration is due to human
activity and not natural factors comes from - ANSWER -estimates of changes
in the amount of carbon dioxide from natural sources such as volcanoes and the
oceans can account for no more than about 1% of the rise in the atmospheric
concentration
-the ratio of carbon isotopes is consistent with the increase in carbon dioxide
levels coming primarily from the burning of fossil fuels
-the amount of the rise in the atmospheric concentration tracks almost perfectly
with the amount of carbon dioxide being released by industry
Measurements of carbon dioxide concentrations in our atmosphere over the past
800,000 years show - ANSWER a direct correlation with global surface
temperatures
As global warming raises the moisture content in our atmosphere, storms will -
ANSWER become more numerous and severe
Climate models predict that due to the melting of the polar ice caps, sea levels
by the end of this century - ANSWER may rise by several meters
A pattern of dark lines on a continuous background is referred to as -
ANSWER an absorption line spectrum
Measuring where the thermal radiation spectrum of a dense object peaks allows
us to determine its - ANSWER temperature
The main way astronomers determine the physical and chemical properties of
an object in the distant universe is through - ANSWER spectroscopy
Recall that stars are classified with types from the spectra sequence
OBAFGKM. In general, an ordinary (hydrogen-fusing, or main-sequence) star
of spectral type A is ________ than a star of spectral type K. - ANSWER
hotter, more luminous, and more massive
Consider a star that is less massive than the Sun. For a planet to receive the
same intensity of light from this star as Earth receives from the Sun, the planet
