A new from of radiation that had the ability to pass through many materials that absorb visible light was discovered by:
Albert Einstein Wilhelm Roentgen Stephen Jay Gould Isaac Asimov

This new form of radiation is called:
Positronic Waves Light Waves Lasers X-Rays Dark Matter

When an average to large sized mass star collapses it leaves behind a:
Black Hole Neutron Star White Dwarf Planet

When a very large mass star collapses it leaves behind a black hole. However when a small mass star collapses it leaves behind a:
White Dwarf Black Hole Neutron Star Planet

X-Rays pass through flesh but not through bone because bone is more:
acidic dense negative positive electromagnetic
than carbon and water atoms in flesh.

The first imaging X-Ray Observatory was:
ROSAT ASCA Chandra Einstein Uhuru