Author Archives: Shannon Hall

Shannon Hall

About Shannon Hall

Shannon Hall, a freelance science journalist, has two B.A.'s in physics-astronomy and philosophy, as well as an M.S. in physics (with an emphasis in astronomy). She is currently working toward a second M.S. in science journalism.

A supernova remnant about 24,000 light years from Earth.

Supernova Remnant in Technicolor

Take a look at this supernova remnant from radio waves to x-rays to see multiple features of its bubble-like expanding shock wave. Supernovae — the dramatic explosions of massive stars ending their lives — can outshine their host galaxies for weeks, allowing them to be seen across millions of light-years of empty space. On...

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A New Galactic Yardstick

Astronomers have developed a new method to measure distances to bright but faraway galaxies, a tool which will help better constrain the expansion rate of the universe.

An artist's conception of the debris disk around Beta Pictoris.

A Chaotic Planet-Forming Disk

A new map of Beta Pictoris reveals an asymmetric clump of carbon monoxide likely produced in cometary collisions. It provides a rare glimpse at the chaotic birth of a planetary system.

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A Meteorite Lights up the Lunar Night

Astronomers have witnessed the largest lunar impact to date. With an impact energy equivalent to 15 tons of TNT — approximately 3 times as great as the previous record-holder — the flash was visible even to the naked-eye.

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The Purest Star Tells an Ancient Tale

Astronomers have discovered the purest star to date. Composed almost exclusively of hydrogen and helium — with 15 million times less iron than our Sun — it illuminates what happened among the first supernovae in the early universe.

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Unveiling Ganymede

Get an eyeful of the solar system’s largest moon — a world of ancient, crater-packed plains and broad swaths of younger grooved terrain that defies easy explanation.