Doesn't this look like the cosmic equivalent of a field of irises? Perhaps that's why this cloud of gas and dust is called the Iris Nebula.
NASA released this image today and explains:
The striking blue color of the Iris Nebula is created by light from the bright star SAO 19158 reflecting off of a dense patch of normally dark dust. Not only is the star itself mostly blue, but blue light from the star is preferentially reflected by the dust -- the same affect that makes Earth's sky blue. The brown tint of the pervasive dust comes partly from photoluminescence -- dust converting ultraviolet radiation to red light. Cataloged as NGC 7023, the Iris Nebula is studied frequently because of the unusual prevalence there of Polycyclic Aromatic Hydrocarbons (PAHs), complex molecules that are also released on Earth during the incomplete combustion of wood fires. The bright blue portion of the Iris Nebula spans about six light years. The Iris Nebula, pictured above, lies about 1300 light years distant and can be found with a small telescope toward the constellation of Cepheus.
Image credit: NASA
Upstreamism advocate Rishi Manchanda calls us to understand health not as a "personal responsibility" but a "common good."
- Upstreamism tasks health care professionals to combat unhealthy social and cultural influences that exist outside — or upstream — of medical facilities.
- Patients from low-income neighborhoods are most at risk of negative health impacts.
- Thankfully, health care professionals are not alone. Upstreamism is increasingly part of our cultural consciousness.
No, depression is not just a type of 'affluenza' – poor people in conflict zones are more likely candidates
- Often seen as typical of rich societies, depression is actually more prevalent in poor, conflict-ridden countries
- More than one in five Afghans is clinically depressed – a sad world record
- But are North Koreans really the world's 'fourth least depressed' people?
America isn't immune to attempts to remove books from libraries and schools, here are ten frequent targets and why you ought to go check them out.
- Even in America, books are frequently challenged and removed from schools and public libraries.
- Every year, the American Library Association puts on Banned Books Week to draw attention to this fact.
- Some of the books they include on their list of most frequently challenged are some of the greatest, most beloved, and entertaining books there are.
Two new studies say yes. Unfortunately, each claims a different time.
- Research at the Weizmann Institute of Sciences declares evening to be the best time for an exercise session.
- Not so fast, says a new study at UC Irvine, which replies that late morning is the optimal workout time.
- Both studies involved mice on treadmills and measured different markers to produce their results.
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