Starship Asterisk*

Ann wrote:I note that the Gegenschein is blue. I believe that the color is correct, since the colors of the stars seem correct. Possibly, however, the color balance of this picture might be "slightly blue".

APOD Robot wrote:During the day, a phenomenon similar to the gegenschein called the glory can be seen in reflecting air or clouds opposite the Sun from an airplane.

Matt Hiller wrote:About the Specter of the Brocken mentioned: This phenomenon always occurs is just more visible when projected onto clouds. I noticed when I ride a bike on a street with grass growing on the bank, I can see the grass reflecting the sun light slightly brighter just around the shadow of my head. Riding a bike helps as you pass the grass and can see the change in brightness.

owlice wrote:

Matt Hiller wrote:
About the Specter of the Brocken mentioned: This phenomenon always occurs is just more visible when projected onto clouds. I noticed when I ride a bike on a street with grass growing on the bank, I can see the grass reflecting the sun light slightly brighter just around the shadow of my head. Riding a bike helps as you pass the grass and can see the change in brightness.

That's heiligenschein, which is made a different way than a glory or Brocken spectre.

http://en.wikipedia.org/wiki/Heiligenschein wrote:
<<Heiligenschein ("holy shine") is an optical phenomenon which creates a bright spot around the shadow of the viewer's head. It is created when the surface on which the shadow falls has special optical characteristics. Dewy grass is known to exhibit these characteristics, and creates a Heiligenschein. Nearly spherical dew droplets act as lenses to focus the light on the surface beneath them. Some of this light 'backscatters' in the direction of the sunlight as it passes back through the dew droplet. This makes the antisolar point appear the brightest.
The opposition effect creates a similar halo effect, a bright spot of light around the viewer's head when the viewer is looking in the opposite direction of the sun, but is instead caused by shadows being hidden by the objects casting them. When viewing the Heiligenschein, there are no coloured rings around the shadow of the observer, as in the case of a glory.

http://www.classicalconnect.com/archive wrote:
<<Beethoven’s String Quartet no. 13 in B-flat major op. 130, though second in order of publication, was actually composed during 1825-6 after the quartet in a minor, op. 132, making it the last of the quartets composed to fulfill the commission from the Russian prince Nikolai Galitzin. Whereas the quartet in a minor was Beethoven’s reflection on his recovery from a life-threatening illness, which gave birth to the profound and solemn "Heiliger Dankgesang" (Song of Thanksgiving) that forms the quartet’s centerpiece, the Quartet in B-flat major is quite possibly then the expression of renewed vigor and the composer’s exuberant return to his art. Hardly anywhere in the piece is there a mournful or sad measure.>>

quigley wrote:I recall photos of the astronauts on the moon photographing the "halos" of light around the shadows of their heads on the lunar surface and it being labeled as "the glory" in those photos. Which phenomenon was occurring in that case?

CapMephisto wrote:Isn't this the same picture from, I think, May 7, 2008?

sinanipek wrote:Is the Solar System a part of a nebula? I mean, if we look to the Sun from, say, Sirius, can we see the nursing nebula from which Sol came from?

Chris Peterson wrote:

sinanipek wrote:
Is the Solar System a part of a nebula? I mean,
if we look to the Sun from, say, Sirius, can we see the nursing nebula from which Sol came from?

No. We're currently passing through a region were the interstellar medium is a bit denser, which you might think of as a sort of instrumentally detectable nebula, but as we usually use the word, we are not in a nebula. The nebula that our system formed from is long since dissipated.

http://en.wikipedia.org/wiki/Local_Interstellar_Cloud wrote:

Click to view full size image

<<The Local Interstellar Cloud (or Local Fluff or LIC) is the interstellar cloud roughly 30 light years or 9.2 parsecs across through which the Earth's Solar System is currently moving. It is currently unknown if the Sun is embedded in the LIC, or in the region where the LIC is interacting with the neighboring G-cloud. The Solar System is thought to have entered the Local Interstellar Cloud at some time between 44,000 and 150,000 years ago and is expected to remain within it for another 10,000 to 20,000 years. The cloud has a temperature of about 6000 K, about the same temperature as the surface of the Sun. It is not very dense, with 0.3 atoms per cubic centimeter; less dense than the average for the interstellar medium in the Milky Way (0.5 atoms/cm³), though six times denser than the gas in the Local Bubble (0.05 atoms/cm³) which surrounds the local cloud. In comparison, Earth's atmosphere at the edge of space has 12 billion atoms per cubic centimeter, dropping to 52 million at 150 km.

The cloud is flowing outwards from the Scorpius-Centaurus Association, a stellar association that is a star-forming region. The cloud formed where the Local Bubble and the Loop I Bubble met. The Sun is embedded in the Local Interstellar Cloud, as are a few other nearby stars including Alpha Centauri, Altair, Vega, Fomalhaut, and Arcturus. The Local Interstellar Cloud's potential effects on Earth are prevented by the solar wind and the Sun's magnetic field. This interaction with the heliosphere is under study by the Interstellar Boundary Explorer (IBEX), a NASA satellite mapping the boundary between the Solar System and interstellar space.>>

Robolt wrote:
Is Gegenschein ever visible to the naked eye?

• Yes.

http://en.wikipedia.org/wiki/Gegenschein wrote:
<<The gegenschein was first described by the French Jesuit astronomer and professor Esprit Pezenas (fr) (1692–1776) in 1730. Further observations were made by the German explorer Alexander von Humboldt during his South American journey from 1799 to 1803. It was also Humboldt who gave the phenomenon its German name Gegenschein.

The Danish astronomer Theodor Brorsen published the first thorough investigations of the gegenschein in 1854. He was also the first to observe that the zodiacal light can embrace the complete sky, because under near-perfect conditions, a feeble light bridge connecting the zodiacal light and the gegenschein can be observed. Besides, Brorsen had already proposed the correct explanation for the gegenschein (interplanetary dust reflections).

In modern times, the gegenschein is not visible in most inhabited regions of the world due to light pollution.>>

Robolt wrote:Is Gegenschein ever visible to the naked eye?

DavidLeodis wrote:
The explanation implies that the picture was taken in October 2008, but in the information brought up through the "Pictured above" link it however states "The image was obtained by Yuri Beletsky in October 2007". I thought I would mention what is presumably a typographical error in the explanation.

JohnD wrote:Apart from the gegenshein.......
That very deep, very wide starscene allows what appear to be 'lines' of stars.
One in particular runs from the telescope building in the middle of the pic, upwards and slightly to the left. There are many others, some straightish and some curlicued.
I'm aware that the more points on a graph, the easier it is to draw straight lines through them, so a figment of our Pareidolia.
Or is it to do with photography?