Monday, December 27, 2010

Galactic distances - comparing M31 and NGC891

At a recent star party, we showed guests views of M31, the Andromeda Galaxy, and it was surprising to some just how big it appears to us (because it's so close, in terms of intergalactic distances). Now, earlier this week I published an image of NGC891. Well, two nights ago I photographed a portion of M31 (that's all that would fit in the field of view) and thought a side-by-side would make for an interesting comparison.

The field of view in both images is 26.4 arc-minutes, or, a little less than the
apparent width of a full moon.

http://www.pbase.com/wjshaheen/image/130070896/large
Scroll down to find the links to the individual galaxies' images.

2 comments:

  1. 3d bioprinting = Immortality = go to stars

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  2. ...interstellar travel constant acceleration (Sun-Deneb: 1000g)... Earth...the 2 ships that will go formation flying for mutual assisting if there are problems...indestructible structure made of Hexapentas material, awaiting in airport the arrival of passengers... Day 1: zero-speed... THE SHIPS TAKEOFF... navigation computer places on screen the spacecraft in the center of sphere...spherical\tridimensional\spatial Heading: Deneb... Antimatter rocket engines...ON... Here we go...goooooo!...1g...10g...100g...constant acceleration cruise: 1000g (9.8 kms/sec²)... Inside the living areas (the same as going submerged in water: constant acceleration downwards...less...constant thrust, constant acceleration, from water upwards)...the gravitational transformers, perfectly synchronized with the acceleration, running: 1000g constant acceleration toward the floor (motors)...less...999g constant acceleration toward the ceiling (gravitational transformers) = 1g constant acceleration toward the floor... 8.5 hours: light-speed = 1c...the fusion reactor as an artificial sun illuminating the immense Vital Support Gardens to lowering, from their comfortable apartments, cheerful passage to the pool...the electromagnetic shield anti-radiation...antigravity fields generator run forward, working: light objects away from the path of the ship...and trajectory ship away from the heavy objects...superluminal-speed > 1c... 42.5 hours: reaches hyperluminal-speed = 5c... Day 508: Half Journey...1000 light years...high hyperluminal-speed = 1435.39c... OFF engines...a few minutes of weightlessness during maneuver...the ship rotates 180º around its axis...motors ON again and... STARTS TO BRAKE... Day 1017 (2.79 years): End Path party...2000 light years...zero-speed... The forever young passage of the 1st Immortal Generation (3D Bioprinting...Telomerase...modified Biological Timers...) disembarks at destination: an extra-stellar planet which came errant to orbit of Deneb giant.

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