Question 37·Medium·Transitions
Black holes were once considered purely theoretical objects, impossible to observe directly because no light can escape them. ______ advances in gravitational-wave astronomy have allowed scientists to detect black hole mergers, providing concrete evidence of their existence.
Which choice completes the text with the most logical transition?
For SAT transition questions, first summarize each sentence or clause in simple words and ask what the relationship is: similarity, contrast, cause/effect, example, or time/order. Then quickly test each option by plugging it into the sentence and checking whether it accurately describes that relationship—ignore what "sounds nice" and focus only on logic. Eliminate any choice that would change the meaning (for example, adding contrast where there is none or cause/effect where nothing is causing anything) and choose the one that matches the actual connection between the ideas.
Hints
Identify the two main ideas
Restate in your own words what the first sentence says about black holes, and what the second sentence says about them. Are they talking about the same time period or different times?
Determine the type of relationship
Ask yourself: Does the second part show a similarity, an opposite idea, a cause-and-effect result, or a shift in when something became true?
Plug in each choice
Read the sentence with each transition option. Focus on whether the transition accurately shows the relationship between the older belief and the new scientific capability.
Step-by-step Explanation
Understand the relationship between the two ideas
Read the full sentence without any transition word:
"Black holes were once considered purely theoretical objects, impossible to observe directly because no light can escape them. ______ advances in gravitational-wave astronomy have allowed scientists to detect black hole mergers, providing concrete evidence of their existence."
The first part talks about what scientists used to think (black holes were only theoretical). The second part explains what now allows scientists to detect them. So the relationship is about a change over time: past belief vs. newer scientific advances.
Decide what type of transition is needed
Ask: Is the second sentence
- giving a similar idea,
- giving an opposite/contrasting idea,
- giving a result/consequence, or
- giving a time update (what is true now or in the recent past)?
Here, the second sentence does not disagree with the first; it just adds new information about what has now become possible. The key idea is that newer developments have changed what we can do, so we need a transition that fits this time change.
Test each option against the logical relationship
Now look at each choice and check it against the sentence meaning:
- "Similarly," would signal that the second sentence is like the first.
- "Consequently," would signal that the second sentence is a result of the first.
- "In contrast," would signal that the second sentence opposes the first.
- One option introduces the idea that these advances are from the recent past, which fits the idea of older beliefs changing because of new technology.
Only the time-related option correctly indicates that these advances are new compared with the older view described in the first sentence.
Choose the transition that shows a recent change
The best transition is "Recently," because it clearly shows that advances in gravitational-wave astronomy are a new development that has changed our ability to observe black holes, matching the contrast between past belief and current capability.