Seeker
Seeker: Week of 10 28 13: This Is the Coldest Place in the Universe
Article reports on the discovery by scientists that the Boomerang Nebula in the Milky Way is the coldest known place in space.
Wikimedia
Wikipedia: Absolute Zero
Wikipedia offers several paragraphs of detailed information on absolute zero, the lowest temperature that can be obtained in any macroscopic system.
Curated OER
Science Kids: Science Images: Boomerang Nebula
A photo taken by the Hubble Space Telescope of the Boomerang Nebula.