Interplanetary space, or the space between planets, can be referred to by a number of synonyms. One common term is "outer space," which encompasses all areas beyond the Earth's atmosphere. "Deep space" is another synonym that refers to the vast and expansive areas beyond the immediate vicinity of our solar system. "Cosmic space" is a more poetic term that suggests the mystery and wonder of the universe. "Stellar void" is a more scientific and technical term that emphasizes the emptiness and lack of matter in interplanetary space. Ultimately, whichever term is used, they all evoke a sense of awe and intrigue about what lies beyond our planet.