thedemon-hauntedworld:

Saturn at Equinox How would Saturn look if its ring plane pointed right at the Sun? Before August of 2009 nobody knew. Every 15 years, as seen from Earth, Saturn’s rings point toward the Earth and appear to disappear. The disappearing rings are no longer a mystery — Saturn’s rings are known to be so thin and the Earth is so near the Sun that when the rings point toward the Sun, they also point nearly edge-on at the Earth. Fortunately, in this third millennium, humanity is advanced enough to have a spacecraft that can see the rings during equinox from the side. The Saturn-orbiting spacecraft, Cassini, was able to snap a series of unprecedented pictures of Saturn’s rings during equinox. A digital composite of 75 such images is shown above. The rings appear unusually dark, and a very thin ring shadow line can be made out on Saturn’s cloud-tops. Objects sticking out of the ring plane are brightly illuminated and cast long shadows. Inspection of these images may help humanity understand the specific sizes of Saturn’s ring particles and the general dynamics of orbital motion.
Credit: Cassini Imaging Team, ISS, JPL, ESA, NASA

thedemon-hauntedworld:

Saturn at Equinox
How would Saturn look if its ring plane pointed right at the Sun? Before August of 2009 nobody knew. Every 15 years, as seen from Earth, Saturn’s rings point toward the Earth and appear to disappear. The disappearing rings are no longer a mystery — Saturn’s rings are known to be so thin and the Earth is so near the Sun that when the rings point toward the Sun, they also point nearly edge-on at the Earth. Fortunately, in this third millennium, humanity is advanced enough to have a spacecraft that can see the rings during equinox from the side. The Saturn-orbiting spacecraft, Cassini, was able to snap a series of unprecedented pictures of Saturn’s rings during equinox. A digital composite of 75 such images is shown above. The rings appear unusually dark, and a very thin ring shadow line can be made out on Saturn’s cloud-tops. Objects sticking out of the ring plane are brightly illuminated and cast long shadows. Inspection of these images may help humanity understand the specific sizes of Saturn’s ring particles and the general dynamics of orbital motion.

Credit: Cassini Imaging Team, ISS, JPL, ESA, NASA

spaceexp:

STS-41D Launch.

spaceexp:

STS-41D Launch.

indypendenthistory:

Lucien Aigner, Albert Einstein at work, Princeton, 1940

indypendenthistory:

Lucien Aigner, Albert Einstein at work, Princeton, 1940

mucholderthen:

The Milky Way, along the Galactic plane
Seen in Wavelengths from Radio frequency through Gamma rays

  1. Radio map at 408 Mhz, showing mainly emission due to scattering of free electrons in the interstellar plasma (i.e. hot gas). The large arc is due to a nearby supernova remnant.
  2. 21 cm radiation map, showing the distribution of neutral Hydrogen gas in the galactic disk, and a few nearby arcs from recent supernovae.
  3. Distribution of H2, or molecular Hydrogen.This maps the “cold” gas in the Galaxy, from which stars will eventually form. The actual observed molecule is CO, rather than H2, which is very difficult to detect directly. The star forming layer of gas is remarkably thin. Infrared maps at the wavelengths 12, 60 and 100 microns.
  4. Infrared emission predominately comes from interstellar dust which is “warmed” to a few 10’s of degrees Kelvin by the ambient radiation field of the Galaxy’s stars.
  5. Near Infrared emission is dominated by cool stars. Since these are typically either old or long-lived stars, this is our best view of the Galaxy with the hot, bright young stars removed. Dust absorption at these wavelengths is very low and we get a clear view all the way to the Galactic center of the disk and bulge.
  6. Optical image of the Galaxy showing the huge effects that dust absorption has on our view of the central regions of the Galaxy. The emission is dominated by young and old stars and by the effects of dust.
  7. X-ray image taken by the Rosat satellite. This view, less clear than the others is dominated by supernova remnants (some of the arc-like features) as well as individual sources of X-radiation from close binary stars or black hole candidates.
  8. Gamma ray view of the Galaxy is dominated by emission from Cosmic Rays (high energy particles) decelerating in the interstellar medium

SOURCE: Chris Flynn’s Galactic Dynamics: Discovering the Milky Way

thedemon-hauntedworld:

A Space Shuttle Over Los Angeles September 2012 Image Credit & Copyright: Stephen Confer

thedemon-hauntedworld:

A Space Shuttle Over Los Angeles September 2012
Image Credit & Copyright: Stephen Confer

asapscience:

… unless an outside force acts upon it. Like, your dog?
via Lingvistov

asapscience:

… unless an outside force acts upon it. Like, your dog?

via Lingvistov