Which of the following is true of quasars?
A) Quasar eruptions became less common as galaxies became more stable.
B) Quasars did not exist until about five billion years ago.
C) Quasars have comparatively smaller look-back time than most galaxies.
D) Quasars eruptions were not common when galaxies were actively forming and colliding.
A
You might also like to view...
PNGs were created because at one point the companies that developed the GIF compression technique required anyone using a GIF to pay a license fee.
Answer the following statement true (T) or false (F)
In a neutron star, the protons and electrons are fused together, leaving only neutrons
Indicate whether the statement is true or false
What is the result of the calculation (0.410 + 0.021 ) × (2.20 × 103 )?
A) 880 B) 946 C) 948 D) 950
Two capacitors with capacitances of 1.0 mF and 0.50 mF, respectively, are connected in series. The system is connected to a 50-V battery. What electrical potential energy is stored in the 1.0-mF capacitor?
a. 5.6 × 10^-4 J c. 0.065 × 10^-3 J b. 4.3 × 10^-3 J d. 1.4 × 10^-4 J