Why can't galaxy evolution go from elliptical to spiral to irregular?
What will be an ideal response?
An elliptical galaxy cannot become a spiral galaxy or an irregular galaxy because ellipticals contain almost no gas and dust from which to make new stars. That means elliptical galaxies can't be young galaxies. Spiral and irregular galaxies cannot evolve into elliptical galaxies because spiral and irregular galaxies contain old stars as well as young stars. The old stars tell you that spiral and irregular galaxies can't be young.
You might also like to view...
Photoelectric Effect Using Stopping Potential: When light of wavelength 350 nm is incident on a metal surface, the stopping potential of the photoelectrons is 0.500 V. What is the maximum kinetic energy of these electrons? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 0.500 eV B. 3.04 eV C. 3.54 eV D. 4.12 eV
Two current loops are coaxial and coplanar. One has radius a and the other has radius 2a. Current 2I in the outer loop is parallel to current I in the inner loop. The magnitude of the magnetic field at the center of the two loops is
A.
B.
.C.
.D.
.E.
.Gravity causes the pressure in the ocean to vary with depth
a. True b. False Indicate whether the statement is true or false
A golfer hits a ball on a level fairway at an angle of 30° relative to the horizontal, and it lands on the green. Another golfer hits a ball with the same speed but at an angle of 60°, and it lands on the green by the other ball. Which statement is accurate for this situation?
a. One ball is in the air longer than the other. b. One ball experiences a greater acceleration while in free flight. c. One ball experiences a smaller acceleration while in free flight. d. Two balls hit at the same speed but different angles will always land in the same location. e. Two balls hit at the same speed but different angles can never land in the same location.