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The origin of the idiom "space cadet" can be traced back to the mid-20th century, specifically the 1950s. It emerged during the space race era when interest in space exploration was on the rise. The phrase often carries a playful or lighthearted tone, but it can also carry a slight negative connotation, implying a lack of seriousness or engagement.

The idiom "have two left feet" originates from the world of dance, specifically referring to a person's lack of coordination or gracefulness while moving. It can be applied to various situations, such as describing someone's inability to dance well, play sports proficiently, or navigate through complex physical tasks.

The idiom "be all thumbs" has its origin in the notion of someone being clumsy or uncoordinated with their hands or fingers. The phrase signifies a lack of dexterity or finesse in handling objects or performing fine motor skills, as if all their fingers were thumbs. It is a figurative expression highlighting a person's clumsiness or lack of skill in tasks that require manual coordination.

The origin of the idiom "have a screw loose" is not definitively known, but it is believed to have originated from the mechanical world, where a loose or missing screw could cause a machine or device to malfunction. It can be used to highlight eccentricities, irrational thinking, or unusual actions, often in a light-hearted or humorous manner, though it should be used with caution to avoid causing offense.

The idiom "a square peg" originates from the concept of trying to fit a square-shaped peg into a hole that is round in shape. This phrase is used to describe a clear mismatch or incongruity between someone or something and their environment or role, emphasizing a lack of compatibility or suitability.

The idiom "the odd one out" originates from the concept of identifying a person or thing that is different or does not belong in a given group or set. The phrase is typically employed when there is a clear contrast or anomaly within a group, highlighting the uniqueness or peculiarity of the individual or item in question. This idiom is often used to emphasize a sense of being different, separate, or out of place.

The idiom "queer as Dick's hatband" likely emerged from the use of "queer" as a word meaning "strange" or "peculiar," combined with the reference to Dick's hatband, which could symbolize something unusual or out of the ordinary. It was often employed in casual conversation or informal writing to convey a sense of peculiarity or oddity. However, it's important to note that the phrase is outdated and not commonly used in contemporary English.

The idiom "live on another planet" has its origins in the early days of science fiction literature and the popularization of space exploration. During the mid-20th century, as humanity's fascination with space grew, the idea of living on other planets became a prominent theme in science fiction stories. Today, this idiom is often used figuratively to describe someone who seems detached from reality, lost in their own thoughts or imagination, or having different interests or priorities than those around them. It can be used in various contexts, such as describing individuals deeply engrossed in their own fantasies, daydreamers, or those who have unconventional or eccentric viewpoints. This idiom is often used in casual conversations or informal settings to convey a sense of disconnect or otherworldliness.