09/11/2016

What are active galactic nuclei?

In the 1970s, astronomers became aware of a compact radio source at the center of the Milky Way Galaxy – which they named Sagittarius A. After many decades of observation and mounting evidence, it was theorized that the ...

A little light construction—laser welding in three acts

Welding is said to be more art than science. In part, this is a nod to the vital, skilled work that welders perform. It's also recognition of the fact that the physics of the process is really, really difficult to understand.

Making artificial 'cells' move like real cells

Artificial "cells" could someday zoom around in the body and deliver medicines to specific locations, act as in-tissue diagnosticians and provide viable replacements for whole cells and organs. To do this, they will need ...

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