I observe a galaxy that is 100 million light-years away: what do I see?
A) the light from the galaxy as it is today, but it is blueshifted
B) the light from the galaxy as it is today, but it is redshifted
C) the light from the galaxy as it was 100 million years ago and it it blueshifted
D) the light from the galaxy as it was 100 million years ago and it is redshifted
E) Nothing: the galaxy lies beyond the cosmological horizon.
D
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The element rubidium (Rb, atomic number 37) is in Group IA of the periodic table, thus the chemical bonding should be ______________.
Fill in the blank(s) with the appropriate word(s).
What element is found in all life on Earth?
a. hydrogen b. iron c. carbon d. oxygen e. nitrogen
Analysis of stellar spectra shows that most stars consist of 71% ________, 27% ________, and a 2% mix of the other elements.
A. hydrogen; helium B. hydrogen; oxygen C. helium; hydrogen D. oxygen; nitrogen
A weathering process that involves the buildup of salts on rock surfaces through evaporation where these salts weaken the cements that bond the rocks so that they break is
What will be an ideal response?