The list of nearby stars in the TPOD made me pull up the wikipage, which cascaded more wikipages to harvest. The thing that caught my eye was the concept of the "Local Bubble".
Local Bubble wrote:The Local Bubble is a cavity in the interstellar medium (ISM) of the Orion Arm of the Milky Way. It is at least 300 light years across and has a neutral hydrogen density of about 0.05 atoms per cubic centimetre, or approximately one tenth of the average for the ISM in the Milky Way (0.5 atoms/cc), and half that for the "Local Fluff", or Local Interstellar Cloud (0.1 atoms/cc). The hot diffuse gas in the Local Bubble emits X-rays.
Local Interstellar Cloud wrote:The Local Interstellar Cloud (or Local Fluff) is the interstellar cloud roughly 30 light years or 9.2 Parsecs across through which the Earth's solar system is currently moving. The Solar System is thought to have entered the Local Interstellar Cloud at some time between 44,000 and 150,000 years ago and is expected to remain within it for another 10,000 to 20,000 years. The cloud has a temperature of about 6000 °C, about the same temperature as the surface of the Sun. It is very tenuous, with 0.1 atoms per cubic centimeter; approximately one-fifth the density of the galactic interstellar medium (0.5 atoms/cc), but twice that of the gas in the Local Bubble (0.05 atoms/cc). The Local Bubble is an area of low-density in the interstellar medium, with the Local Cloud a small, more dense area. In comparison, Earth's atmosphere at STP has 2.7 × 1019 molecules per cubic centimeter.
Ignore the consensus discussion of age and supernovae, and look at it as a recent EU phenomenon.
- Are we inside of a nebula looking out?
This is another area of discussion that I'd like the Team to expand on in more essays.
List of nearest stars
Local Interstellar Cloud
Loop I Bubble
http://en.wikipedia.org/wiki/Scorpius-C ... ssociation