Which sentence best expresses the central idea of the passage? 1. Spacecraft can maneuver to avoid colliding with space junk. 2. Collisions in space increase the amount of junk that is in orbit. 3. Reducing space junk is important to the success of future space missions. 4. Astronauts use a sophisticat ed system to dispose of used and supplies.

## Step 1<br />The problem is asking us to identify the sentence that best expresses the central idea of the passage. The central idea of a passage is the main point or concept that the author wants to convey to the reader.<br /><br />## Step 2<br />We need to evaluate each sentence to determine which one best encapsulates the main idea of the passage.<br /><br />## Step 3<br />Looking at the first sentence, "Spacecraft can maneuver to avoid colliding with space junk," this sentence seems to focus on a specific aspect of dealing with space junk, rather than the overall theme of the passage.<br /><br />## Step 4<br />The second sentence, "Collisions in space increase that is in orbit," while informative, does not seem to idea of the passage.<br /><br />## Step 5<br />The third sentence, "Reducing space junk is important to the success of future space missions," seems to encapsulate the main idea of the passage. It discusses the importance of reducing space junk for the success of future space missions.<br /><br />## Step 6<br />The fourth sentence, "Astronauts use a sophisticated system to dispose of used and supplies," while informative, does not seem to capture the main idea of the passage.