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Iris Nebula and Molecular Clouds in Cepheus A dusty 6.25° × 4.0° large region in Cepheus containing NGC 7023 (Iris Nebula) and VdB 4141 (Ghost Nebula). The image was shot with SDSS I', R' and G' filters. Regions known as dark nebulae are reddish because they become transparent in infrared light (ma...

LBN 1495 in Taurus Molecular Cloud A 6.25° × 4.0° large view of the Taurus Molecular Cloud containing LBN 1495 and the Baby Eagle nebula. The image was shot with SDSS I', R' and G' filters. Regions known as dark nebulae are reddish because they become transparent in infrared light (mapped to red). ...

New pseudo color images (made from less than 3 colors) of SH2-86, M27 and SH2-105 Click on the images for detailed information, more views and full resolution pictures. http://www.simg.de/nebulae1/vul-00-h1-400.jpg http://www.simg.de/nebulae1/cyg-01-ho-400.jpg http://www.simg.de/nebulae1/cyg-01-oh-4...

SH2-254 thru SH2-258 The nebula complex SH2-254 thru SH2-258 lies on the border between constellations Orion and Gemini and is a part of the GEM OB1 molecular cloud. Click on the images for detailed information and full resolution pictures. http://www.simg.de/nebulae1/ori-04-sho-400.jpg --- My Home...

SH2-206 (NGC 1491) SH2-206 (also known as NGC 1491) is an emission nebula in constellation Perseus. The interaction of the stellar wind of the ionizing star with a larger molecular cloud forms a small bubble-like structure. Click on the images for detailed information and full resolution pictures. ...

M51 in H-alpha and continuum light M51 (also known as Whirlpool Galaxy) are two interacting galaxies in constellation Canes Venatici. The larger one (M51A or NGC 5194) is a spiral galaxy, the smaller companion (M51B or NGC 5195) is a distorted a dwarf galaxy. The image is calculated with and withou...

SH2-184 (NGC 281, Pacman Nebula) and IC 1590 SH2-184 (also known as NGC 281 or Pacman Nebula) is an emission nebula in constellation Cassiopeia containing many Bok globules and the very young star cluster IC 1590. Click on the images for detailed information and full resolution pictures. http://www...

SH2-170

SH2-170 is a faint emission nebula in constellation Cassiopeia.

Click on the images for detailed information and full resolution pictures.


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M63 in H-alpha and continuum light M63 is a spiral galaxy in constellation Canes Venatici. The image is calculated with and without H-alpha information. By toggling between the two variants the correlation between HII gas clouds and bluish regions (containing young stars and probably also OIII gas)...

SH2-162 SH2-162 (also known as NGC 7635 or Bubble Nebula) is an emission nebula in constellation Cassiopeia. The interaction of the stellar wind of the ionizing star with a larger molecular cloud forms a bubble-like structure. Click on the images for detailed information and full resolution picture...

NGC 4244 in H-alpha and continuum light NGC 4244 is a on-edge spiral galaxy in constellation Canes Venatici. The image is calculated with and without H-alpha information. By toggling between the two variants the correlation between HII gas clouds and bluish regions (containing young stars and proba...

SH2-142 SH2-142 (also known as Wizard Nebula) is an emission nebula in constellation Cepheus which is ionized by the young star cluster NGC 7380. Click on the images for detailed information and full resolution pictures. http://www.simg.de/nebulae1/cep-02-sho-400.jpg http://www.simg.de/nebulae1/cep...

NGC 4565 and NGC 4562 in continuum light NGC 4565 is a on-edge spiral galaxy in constellation Coma Berenices. Together with the smaller smaller NGC 4562 it belongs to the Coma I group. Click on the picture for detailed information and full resolution pictures. http://www.simg.de/galaxies/com-00-ib-...

SH2-112

SH2-112 is an emission nebula in constellation Cygnus.

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NGC 4395, NGC 4399, NGC 4400 and NGC 4401 in H-alpha and continuum light NGC 4395 is a low surface brightness galaxy constellation Canes Venatici. NGC 4399, NGC 4400 and NGC 4401 are bright HII regions inside the galaxy. The image is calculated with and without H-alpha information. By toggling betw...

SH2-105 (NGC 6888, Crescent Nebula) SH2-105 (also known as NGC 6888 or Crescent Nebula) is an emission nebula in constellation Cygnus which ionized by a Wolf-Rayet star. Click on the images for detailed information and full resolution pictures. http://www.simg.de/nebulae1/cyg-01-ho2-400.jpg --- My ...

M94 in H-alpha and continuum light M94 is a spiral galaxy in constellation Canes Venatici with two ring structures. The inner ring is an active star formation region and contains a lot of young blue stars and HII regions, the broader outer ring is very faint. The image is calculated with and withou...

NGC 2903 in H-alpha and continuum light NGC 2903 is a barred spiral galaxy in constellation Leo. The image is calculated with and without H-alpha information. By toggling between the two variants the correlation between HII gas clouds and bluish regions (containing young stars and probably also OII...

SH2-101 (Tulip nebula) SH2-101 (Tulip Nebula) is an emission nebula in constellation Cygnus. The images also show a (partially cropped) nebula formed by the jets of Cygnus X-1, a black hole in a binary system which is accreting its companion star. Click on the images for detailed information and fu...

Parallel red lines 20mm wide would ideally generate eyepiece parallel red lines 8mm wide to fit a dilated pupil resulting in an ANGULAR magnification of 2.5. That's the magnification limit I mentioned yesterday. (I noticed you use different font colors and weights. Does this have a meaning?) Accord...

1) Chris was not talking about point sources. If you assume that Chris considers objects like M27 purely as extended objects the following statement from Chris means that they wont become brighter if you use a telescope. The reason it is a matter of biology and not optics is that the individual rod...

But that magnification limit does not mean that color vision is " A matter of biology, not optics ", as Chris stated. (BTW, that limit explains why you wont find 50mm binoculars with a magnification of less than 7). Visually, the only value in a larger aperture is that you can operate at ...

My experience is that Chris is always right. There is a big difference between point sources and extended sources (surface brightness). Surface brightness does NOT change with distance. Point sources fade in brightness as the square of the distance. Most astronomers know the latter, but NOT the for...

I meant it just as I stated it. No telescope of any size can make an object brighter. If it allows you to see a hint of color, it is only because it covers more retinal cells, which provides more signal. A matter of biology, not optics. Of course, an object does not emit more photons if we increase...

No telescope can make an extended object brighter than it is to the naked eye, and only a handful of extended objects are bright enough to (barely) stimulate human color vision. Which is why virtually all deep sky objects are described as gray faint fuzzies. And it's why questions about the "t...