Co-hosted by The Galactic Inquirer, a free online journal on diverse astronomical topics, the American Astronomical Society, North America’s largest organization of...
We investigate star formation in the Sc(s) II-III galaxy M33 by analyzing eight prominent HII regions using multi-wavelength data from the Spitzer Space Telescope and optical imagery. Results indicate that dust emission is a compact tracer of high-mass star formation, while PAH and H-alpha emissions decline more slowly with galactocentric radius.
Just like the dust that stubbornly besmirches your computer monitor, bookcase, and ancestral credenza, cosmic dust is now recognized to have a multiplicity of origins. For decades, astronomers thought that aging red giant stars produced most of the dust responsible for obscuring and reddening our views of nebulae and more distant stars ...
The formula for collisional excitation of the atoms responsible for auroral emission can explain why green auroras from excited oxygen atoms can occur at relatively low altitudes, but red auroras from these same atoms are constrained to higher altitudes of lower density. The same formula also suggests much lower electron velocities (~100 km/s) than are required to excite the oxygen atoms to the required metastable levels for subsequent emission (~1000 km/s).
This year, our eyes were once again redirected to our own Solar System for a just a few fleeting
minutes -- from the myriad wonders of our “seeable” Universe to a small space probe called New
Horizons that at 7:49 AM (EST) on July 14 th 2015 passed within 7,750 miles of little Pluto at a
record-breaking speed of 30,800 miles per hour (49,600 kilometers per hour).
