How X-rays WorkAn X-ray machine makes X-rays and directs them toward an object. The X-rays pass through some parts of the object but are blocked by other parts. For example, X-rays directed at a body pass through the skin and soft tissues, such as muscle. But hard body parts, such as bones, block the X-rays. Special film behind the body captures the image made by the X-rays. When the film is developed, the hard parts appear white on the film. The soft parts appear black.. Special X-ray telescopes pick up X-rays given off by objects in outer space, such as distant stars. Manufacturers use X-rays to find hidden flaws in products. At airports, security equipment uses X-rays to look for hidden weapons in the baggage of travelers.. X-Rays, Scans, Radiation, and Kids. What Parents Need to Know Before the Doctor or Dentist Orders a Scan . By Brenda Goodman, MA. From the WebMD Archives. When a child is ill or injured, you want .