Cosmic strings are neither subatomic particles nor remnants from the Big Bang, at least not in the way we typically understand those terms. They are a theoretical entity proposed by cosmologists, and their existence remains unconfirmed.

Here's why:

* Subatomic particles are tiny, fundamental building blocks of matter, like electrons, quarks, and neutrinos. Cosmic strings are vastly larger, potentially spanning vast distances across the universe.

* Remnants from the Big Bang usually refer to particles like the cosmic microwave background radiation, or perhaps dark matter. While cosmic strings could have formed during the early universe, they wouldn't be considered remnants in the same way.

Instead, cosmic strings are more accurately described as:

* Topological defects: They are hypothetical flaws in the fabric of spacetime that could have arisen during the very early universe, when the universe was undergoing a rapid expansion and cooling.

* One-dimensional objects: Unlike particles which are point-like, cosmic strings are thought to be long, thin strands of energy.

The key difference: Subatomic particles are fundamental units of matter, while cosmic strings, if they exist, would be massive, energetic objects with significant gravitational effects on their surroundings.

In summary: Cosmic strings are not subatomic particles or remnants of the Big Bang in the traditional sense. They are a theoretical concept proposed to explain certain cosmological observations and are considered a potential source of exotic physics.