Robot discovers new mineral on moon.

Meaning: A robot is finding a new type of rock or substance on a moon.

Choice of Words: "Robot" is a machine that can do tasks on its own, "discovers" means to find something new or unknown, "new mineral" is a type of rock or substance that has not been seen before, and "moon" is a natural satellite that orbits a planet. Together, the sentence describes a robot finding a new type of rock or substance on a natural satellite that orbits a planet.

Alternative Expressions

The robot found a new rock on the moon.

Meaning: This means that a specific robot has found a new type of rock on the moon that has never been seen before. It's like saying, A robot has found a new type of rock on the moon that no one has ever seen before.

Choice of Words: The is used to refer to a specific thing. Robot is a machine that can do many things on its own. Found means to come across something that was not known before. New means something that has not existed before. Rock is a hard substance that is found in the earth. Moon is a large ball that goes around the earth. When you put them together, "The robot found a new rock on the moon" means that a specific robot has found a new type of rock on the moon.

A machine found a new thing on the moon.

Meaning: This means that any machine has found a new type of object on the moon that has never been seen before. It's like saying, A machine has found something new on the moon that no one has ever seen before.

Choice of Words: A is used to refer to any one of a group of things. Machine is a device that can do many things on its own. Found means to come across something that was not known before. New means something that has not existed before. Thing is a general term for any object. Moon is a large ball that goes around the earth. When you put them together, "A machine found a new thing on the moon" means that any machine has found a new type of object on the moon.

Related Expressions