DARPA developing a foldable space telescope

http://www.space.com/25548-military-foldable-space-telescope-darpa-space.ht

 

DARPA’s development of a relatively low cost space telescope dwarfs the size of other well know space telescopes such as the Hubble and Spitzer Space Telescope(s).

Foldable Space Telescope size comparison

Size Comparison of DARPA’s foldable space telescope concept versus other space telescopes

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Homemade Telescope Lens Grinding Machine

Check out this descriptive page listing a few devices created by amateur telescope enthusiasts that developed their own methods and tools for creating lenses.

http://binoculas.net/telescope-grinding-machine/

Homemade grinding machine for telescope lens manufacturing

Lens Grinding

Entangling Photons with Mismatched Colors

Entangling Photons with Mismatched Colors.

Alessandro Fedrizzi, The University of Queensland, Brisbane, Queensland 4072, Australia
Published March 10, 2014 | Physics 7, 25 (2014) | DOI: 10.1103/Physics.7.25
Using a frequency eraser, researchers have, for the first time, entangled two independent photons with different frequencies.