The type of wave that travels faster through a gas than a solid, is used to take images of bones, and travels at 300,000,000 m/s in space is electromagnetic radiation, specifically X-rays.

Here's why:

* Faster in Gas: Electromagnetic waves travel faster in less dense mediums like gases compared to denser mediums like solids.

* Imaging Bones: X-rays are used in medical imaging because they can penetrate soft tissues but are absorbed by denser materials like bones.

* Speed in Space: The speed of light in a vacuum, which is a form of electromagnetic radiation, is approximately 300,000,000 meters per second (m/s).

Let me know if you have any other questions.