Calculating the number of galaxies in the universe is no small task. Images from the
Hubble telescope allowed scientists to calculate that there are around 200 billion visible
galaxies. However, some scientists were skeptical of the numbers. So they turned to our
own galaxy, the Milky Way, to recalculate. It is surrounded by roughly fifty dwarf galaxies,
which the Hubble technology cannot detect. The scientists added the unobservable
galaxies into the equation. As it turns out, the number of galaxies in Hubble's images
might be closer to two trillion.
How does the organization of the passage effectively convey the author's message?
A. The cause and effect structure shows how the dwarf galaxies surrounding the Milky Way were discovered.
B. The comparison of the two sets of Hubble images supports the new scientific theory about the size of the universe.
C. The description of the sequence of events illustrates the difficulty in calculating the number of galaxies.