How do we know that the Universe's expansion is speeding up?
A.) We've measured it for a long time and seen that galaxies are moving faster with time.
B.) We look at objects from different times in the past to see how expansion changes with time.
C.) We can see the change in the expansion rate from year to year.
D.) We can see the change in the expansion rate from month to month.
E.) We can see the change in the expansion rate from week to week.
Answer: B.) We look at objects from different times in the past to see how expansion changes with time.
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(a) Aluminum metals (b) Alumina ceramic (c) Polyvinylchloride (d) Rubber
Diffraction Gratings: When light illuminates a diffraction grating with 7000 lines per centimeter, its second order maximum is at 62.4°. What is the wavelength of the light?
A. 336 nm B. 363 nm C. 633 nm D. 752 nm
Why aren't there young stars in the halo?
What will be an ideal response?
The ________ theory was based on the assumption that the universe was eternal and unchanging
a. inflationary b. accelerating c. steady-state d. big bang