As Earth rotates, circumpolar stars appear to move counterclockwise around the north celestial pole
Indicate whether the statement is true or false
T
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Liquid mercury is contained in a lead beaker as shown in Figure 1-14. Estimate the amount of mercury that migrates by diffusion into the beaker after 48 hours if the concentration of mercury is 2% at a distance 0.01 cm into the beaker wall from the inside surface. Assume that the system is at 20ºC and neglect evaporation to air.
Which part of the Sun is observable during a total solar eclipse?
a. core b. solar disk c. sun spots d. photosphere e. chromosphere
How did Edwin Hubble measure the distance to the Andromeda Galaxy?
A) He measured its parallax. B) He applied the period-luminosity relation to Cepheid variables. C) He deduced it from its redshift. D) He used white dwarf supernovae.
The spectra of stars in other galaxies show a Doppler shift of spectral lines toward the ________ (color) end of the spectrum, thus providing evidence for the expansion of the universe.
Fill in the blank(s) with the appropriate word(s).