A Tour of Circinus X-1 (06-25-2015)
These rings are light echoes, similar to sound echoes that we may experience here on Earth.

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--  X-ray Echoes Pinpoint Location of Distant Flaring Neutron Star

Light Beyond the Bulb: Intro to Light (06-04-2015)
The year 2015 has been declared to be the International Year of Light and Light-based Technologies by the United Nations.

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--  Light Beyond the Bulb

A Tour of Space-time Foam (05-29-2015)
Since space-time foam, as it is called, is so tiny, scientists cannot observe it directly.

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--  NASA Telescopes Set Limits on Space-time Quantum Foam

Chandra Sketches: Chandra Explained (05-18-2015)
Chandra does not look at light that we can see with our eyes. It detects x-rays from the Universe.

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A Tour of SGR 1745-2900 (05-15-2015)
A new study reveals that the X-ray output from SGR 1745-2900 is dropping more slowly than for other magnetars, and its surface is hotter than expected.

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--  Magnetar Near Supermassive Black Hole Delivers Surprises