What are superclusters?
What will be an ideal response?
A supercluster is a cluster of galaxy clusters. Superclusters are linked to form long filaments and walls outlining voids that seem nearly empty of galaxies. These filaments and walls appear to be the largest structures in the Universe.
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Wave Characteristics: A cordless phone operates at 900 MHz. What is the wavelength of the electromagnetic wave used by this phone? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
What is an accretion disk?
A) a disk of hot gas swirling rapidly around a white dwarf, neutron star, or black hole B) any flattened disk in space, such as the disk of the Milky Way Galaxy C) a stream of gas flowing from one star to its binary companion star D) a disk of material found around every white dwarf in the Milky Way Galaxy
How many atoms are in one gram of 27 13 Al?
a. 
b. 
c. 
d. 
e. 
What evidence supports the contention that the strong nuclear force is stronger than the electrical interaction at short inter-nuclear distances?
A) Protons are able to exist side-by-side within an atomic nucleus. B) Neutrons spontaneously decay into protons and electrons. C) Uranium deposits are always slightly warmer than their immediate surroundings. D) The radio interference that arises adjacent to any radioactive source.