The Balmer series of hydrogen absorption lines in stars is located in what part of the electromagnetic spectrum?
The hydrogen lines of spectral type A main-sequence stars are ____.
Vega is an A0 main-sequence star. Based on this information, which statement is true?
The Hertzsprung-Russell diagram can be labeled many different ways. Which coordinates CANNOT be used on an H-R diagram?
If a star has an apparent magnitude of +5 and an absolute magnitude of –10, what can we say about that star?
Any star that is more luminous than the Sun, but has the same temperature as the Sun, is a(n) ____.
Which star has the largest diameter?
The most accurate way to determine the surface temperature of a star is to study the pattern of emission lines from various atoms.
The Hertzsprung-Russell Diagram is a plot for stars using absolute magnitude versus temperature.
The most common type of star is a(n) ____.
Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 93 hours. The star becomes dimmer for about 2 hours. The most likely explanation for this is that the star ________.
The classification of stellar spectra started with the amount of hydrogen in the star’s spectrum; however, now a better scheme uses the star’s _____.
The luminosity of a star is the ____.
Which star has the highest density (mass per unit volume)?
Absolute visual magnitude is calculated at a standard distance of ____.
In addition to serving as the basic structural molecule for a cell, proteins can also be __________.
Why couldn’t life originate on the Moon?
What technology do astronomers use to search for extraterrestrial life?
This object appears to have geysers on its surface, suggesting the possibility of hydrothermal activity.
Which celestial body is the most likely candidate for life to emerge and evolve?
What part of a cell stores the coded information?
Which moon is rich in organic molecules but too cold to support chemical evolution?
When a cell divides, only one cell gets the original DNA molecules.
Which type of main-sequence star(s) is a good candidate for searching Earth-like planets with life?
What prevents Titan from being a candidate for supporting an evolution of life?
Human DNA is made up of billions of chemical bases.
Which telescope did astronomers use in 1974 to send an anticoded message to globular cluster M13?
Earth required only 1 million years to produce the first cells and another million years for intelligence to emerge.
The most successful mission so far for locating exoplanets has been this space telescope:
In Miller and Urey’s experiment, what did they use to simulate the atmosphere in a sealed, glass container to produce amino acids and organic molecules?