___________ is (are) observed when light from a distant quasar travels past a massive galaxy between us and the quasar, and this light is focused to form two or more images of the same quasar.
a. A double-lobed radio galaxy
b. Superluminal expansion
c. The gravitational lens effect
d. A blazar
e. Gravitational waves
Question 2
If the stars at the turnoff point of a cluster have a mass of 3M, what is the age of the cluster?
a. 3.01010 years
b. 3.3109 years
c. 6.4108 years
d. 1.61011 years
e. The age of a star cluster cannot be determined from the mass of stars at the turnoff point.
An overview of the two stages of photosynthesis: light reactions and the Calvin cycle
Changes in light quality with depth: (a) the rich colours on a shallow coral reef;
Visible Light Spectrum
Dimmer Distant Supernova
The biochemical reactions of near-infrared light
(a) A turbidometry detector measures laser light directly across from the light source. The sample, ...