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Life in the universe-Chapter 11
Terms in this set (11)
How do other stars differ from the sun?
Mostly made from helium and hydrogen and only difference is their masses
Which stars would make good suns?
High enough proportions of elements besides hydrogen and helium to allow planet formation. Low in mass to live log enough and in the hydrogen-fusing stage of life allows for steady sunlight.
How do we detect planets around other stars?
Astrometric which is when we look for small shifts in stellar positions. Doppler which looks for the back and forth motions of stars. Transits which is when a planet blocks some of the sun.
What properties of extrasolar planets can we measure?
Orbital period and distance from its star. Astrometric and doppler provide masses while transit provides size and even masses in a multiple planet system. To measure density we sue transit and doppler method.
How do extrasolar planets compare with planets in our ss?
Orbit closer to their star
Are systems like ours common?
We don' t have enough data to know.
What kind of extrasolar worlds might be habitable?
Subsurface may be most common and orphan planets that don't orbit a star have possibilities for subsurface life.
How can we detect life on extrasolar planets?
Future telescopes to see snow or clouds and rotational period. Spectroscopic can tell us much more by revealing atmospheric gases.
Are earth-like planets rare or common?
We aren't sure.
How did we learn to classify stars?
Advent of spectroscopy allowed astronomers to study stars by categorizing by spectra
Whats the Hertzsprung-russel diagram?
Plots stars according to their spectral type .
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