How can close analysis of the spectra of quasars let us map the whole universe?
What will be an ideal response?
In addition to the emission lines made by the quasar, absorption lines reveal gas clouds that lie between us and the quasar. The closer clouds show smaller redshifts, so their distances and structures can also be mapped.
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What event marks the birth of a new star?
What will be an ideal response?
Solar winds headed in Earth's direction are deviated mainly by
A) the upper atmosphere. B) the troposphere. C) Earth's magnetic field. D) Earth's radiation belts.
A reasonable estimate for the mass of a typical female college student is
A) 20 kg. B) 50 kg. C) 150 kg. D) 200 kg.
A set of charged spheres carries -1.5 mC and each has mass 15 ?g. What vertical electric field in the laboratory would cause these spheres to continue in a straight line if they were projected horizontally into the electric-field region?
A. -98 ?V/m B. 10 mV/m C. -10 mV/m D. 98 ?V/m