Answer:
The accident of the Columbia space shuttle made the repairs to the Hubble microscope uncertain, as well as the future of this telescope.
Explanation:
The Hubble telescope was a major scientific breakthrough, both in terms of its creation and its launch. It has been in space for over thirty years and there is no date for its shutdown.
This telescope needs maintenance in order to function effectively, however this maintenance has not been done for some time and it is uncertain when it will happen. This uncertainty is an effect that the Columbia space shuttle accident caused. That's because Columbia was responsible for maintaining Hubble, but it exploded when it returned to Earth, killing the entire crew. This made the telescope's repairs uncertain, expensive and dangerous, discouraging its execution.
Answer:
A truly horrifying look at the aftermath of a nuclear war. The sole survivor seems to be the poor starving and diseased dog. The house, automated, continues telling the time and anniversaries, but none except the dying dog is there to hear. As depressing as it was, it had a tremendous impact on me, so that 40 years after I read it, when the Navy wanted to base nuclear weapons within less than a mile of my home (at a base the 9/11 terrorists had on their list of potential targets), I organized the opposition, which ultimately convinced the Navy not to build the base.
Explanation:
A, I think. A compound sentence is two clauses together that make sense by themselves.
