4.1.4 Where we are
Look at Figure 11. It shows that the Sun is in the habitable zone of the Milky Way.
It is far out enough to be relatively isolated from its nearest neighbours and in less danger from the effects of potential supernovae, but sufficiently close in from the outer fringes, where unknown quantities of dark matter lurk.
The search for habitable planetary systems around stars, then, should be directed towards looking for Earth-like planets (ELP) orbiting Sun-type stars at distances considered to be within the habitable zone of the observed star located within the habitable zone of its galaxy.
Next, you will take your photo of Orion for this week.
OpenLearn - In the night sky: Orion
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