hard X ray

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Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

7 of the World’s Deadliest Shipwrecks

Cheetah (Acinonyx jubatus) standing on rock, side view, Masai Mara National Reserve, Kenya

The Fastest Animals on Earth

The tomb of Saint Nicholas in the crypt of the Basilica di San Nicola, Bari, Apulia, Italy

Do the Relics of Saint Nicholas Really Emit a Holy Substance?

Image of Antenna galaxy

The Fermi Paradox: Where Are All the Aliens?

Chinese dragon sculpture or statue.

10 Legendary Creatures from Around the World

Mona Lisa, oil on wood panel by Leonardo da Vinci, c. 1503-06; in the Louvre, Paris, France. 77 x 53 cm.

Why Is the Mona Lisa So Famous?

bat flying

Are Bats Really Blind?

hard X ray

physics

Learn about this topic in these articles:

wavelength

In spectroscopy: Synchrotron sources
…and 200 angstroms), or the hard (high-energy) X-ray portion (1–20 angstroms) of the electromagnetic spectrum.
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