In the text is a photograph that appears to show four identical galaxies arranged as a cross. What are we really seeing?
A) four galaxies that are nearly identical because they were born at about the same time
B) four images of a single background galaxy, created by the gravitational lens of a massive foreground galaxy or cluster
C) a large galaxy with four central masses that glow brightly
D) a picture taken with a poorly made telescope, so that a single large object appears as four fuzzy dots
Question 2
At the Mars Pathfinder landing site, the surrounding rocks are scattered and stacked against each other. This suggests that the spacecraft landed in
A) an area of explosive volcanic activity
B) an ancient floodplain
C) an area subjected to wind erosion
D) the debris from a giant impact
Where mangrove diversity is high, mangrove species show clear patterns of vertical zonation relative
The Sun as it appears from the surface of Earth during the middle of the day
A Cluster of Galaxies
Distant Galaxies
Functional MRI Scans These scans of human brains show localized average increases in neural activity
The phenotypic and genotypic ratios of a dihybrid cross can be derived using a branched-line method