Meaning: Astronauts went into space to learn more about the universe.
Choice of Words: Astronauts: people who travel in space, Explored: examined and studied, Universe: everything that exists, including all of space and time.
Alternative Expressions
Astronauts explored the vast universe.
Meaning: This means that astronauts traveled around space to learn more about everything that exists, including the Earth, the sun, the moon, and all the stars and planets.
Choice of Words: Astronauts are people who travel to space. Explored means to travel around a place to learn more about it. The universe is everything that exists, including the Earth, the sun, the moon, and all the stars and planets. Vast means very large or great in size.
Space travelers journeyed through the boundless cosmos.
Meaning: This means that space travelers traveled through the universe, which is endless and has no limits.
Choice of Words: Space travelers are people who travel to space. Journeyed means to travel from one place to another. The cosmos is another word for the universe. Boundless means without limits or boundaries.
Explorers ventured into the immeasurable expanse.
Meaning: This means that explorers traveled into a very large and open area that is too big to be measured.
Choice of Words: Explorers are people who travel to new places to learn more about them. Ventured means to go on a journey or adventure. Immeasurable means too large to be measured. Expanse means a large, open area of land or water.