Hubble divided the spiral galaxies up in what six subtypes?
What will be an ideal response?
Sa, Sb, Sc, and SBa, SBb, and SBc
You might also like to view...
Kepler's Laws: The planet Jupiter is 7.78 × 1011 m from the sun. How long does it take for Jupiter to orbit once about the sun given that the distance from the earth to the sun is 1.50 × 1011 m?
A. 2.3 years B. 5.2 years C. 6.0 years D. 12 years E. 27 years
A cork floats in an inverted jar sitting on a cart, as shown in the left diagram below. If we suddenly accelerate the cart to the right (as shown in the right diagram) what will the cork do:
A. Lean backward B. Remain vertically floating directly above the base C. Lean forward D. Sink E. Explode
If a hydrogen atom originally in a state with principal quantum number n is excited to state n' = 2n, then
A) its radius and binding energy will quadruple. B) its radius and binding energy will double. C) its radius will double and the binding energy will quadruple. D) its radius will quadruple and the binding energy will double. E) its radius will quadruple and the binding energy will be reduced by a factor of four.
The energy released by the Sun is the outcome of atomic nuclei
1) breaking apart, 2) combining together, and radioactive by-products are a chief result of atomic nuclei 3) breaking apart. 4) combining together. 5) doing neither.