The mystery of dark energy

Dark energy is believed to account for 68 percent of all energy in the known universe, and is responsible for its constant expansion. The particle, which is associated with dark energy has long been predicted, but no one has yet udalo detect it.

All forms of energy that are known to have a particle physics associated with it. 

What are the limits of human vision?

From observations of distant galaxies light years from us to the perception of invisible colors, Adam Hedheyzi on BBC explains why your eyes can do incredible things. Take a look around. What do you see? All these colors, the walls, the windows, everything seems obvious, as it should be here. The idea that we all see it because the particles of light - photons - that bounce off of objects and fall into human vision, it seems incredible.

From the Hubble Space Telescope the smaller wavelength infrared

Providing wavelength coverage from 3 to 180 microns, Spitzer is an important addition to scientific Hubble Space Telescope (English) and the Chandra X-Ray Observatory (English). The smaller wavelength infrared (near-infrared) can see through regions heavily obscured by dust, so that astronomers can study newborn stars. The long wavelengths (far infrared) are very useful for studying the distribution of dust in the Milky Way, an important ingredient for the formation of planets and stars

About 80% of Spitzer observing time will be available to the wider scientific community, through a contest organized observing proposals by the Spitzer Science Center.