Cosmic Nebulae

Cosmic nebulae are gas or dust regions that are stimulated to shine by hot stars (emission nebula, mostly red, Wikipedia) or reflect their light (reflection nebula, mostly blue, Wikipedia).

Planetary nebulae are astronomical nebulae composed of a shell of gas and plasma expelled from old stars at the end of their evolution, e.g. Owl Nebula Messier 97, Wikipedia.

A dark nebula or absorption nebula is a type of interstellar cloud, particularly molecular clouds, that is so dense that it obscures the visible wavelengths of light from objects behind it, such as background stars and emission or reflection nebulae, Wikipedia.

The Heart Nebula IC1805 is an emission nebula located in the northern constellation of Cassiopeia.
The Heart Nebula IC 1805 and the Soul Nebula IC 1848 are and are approximately 7,500 light-years from Earth. The Nebulas are located in the constellation Cassiopeia.
The North America Nebula NGC 7000 and the and Pelican Nebula IC 5070 are emission nebulas in the constellation Cygnus, close to Deneb (the tail of the swan and its brightest star). The shape of the nebula resembles that of the continent of North America, complete with a prominent Gulf of Mexico. At the top right of the picture one can see the pelican head of the Pelican Nebula.
Cynus Wall, part of NGC7000, the North America Nebula
The Lobster Claw Nebula Sh2-157 is a bright emission nebula in the constellation of Cassiopeia. Left below Bubble Nebula NGC7635 and again left below open star cluster M52.
The Cygnus Loop is a large supernova remnant in the constellation Cygnus, an emission nebula measuring nearly 3° across.
The Rosette Nebula NGC 2244 is an emission nebula with an embedded open star cluster in the constellation of the Monoceros.
The Christmas Tree Cluster NGC 2264 at center is an open star cluster in the constellation of the Unicorn (greek: Monoceros). It is a very young star-forming region. The cone-shaped Cone Nebula on the right is a dark nebula and is about seven light-years across.
The Cave Nebula Sh2-155 is an ionized H-II region of ongoing star-forming activity in the constellation Cepheus at an estimated distance of approximately 2,400 light-years from Earth.
The Crescent Moon Nebula NGC 6888 is a peculiar emission nebula in the constellation Cygnus, excited to glow by the Wolf-Rayet star at the nebula's center.
The Sadr region Sh2-108 in the Cygnus constellation is also known as the Gamma Cygni Nebula. The emission nebula surrounds the central star Sadr (γ Cygni). The region also contains many dark nebulae.
The Sadr region Sh2-108 in the Cygnus constellation is also known as the Gamma Cygni Nebula. The emission nebula surrounds the central star Sadr (γ Cygni). The region also contains many dark nebulae, starless version.
The Orion Nebula is an emission nebula in the constellation of Orion. Due to the brightness of its center, the nebula is readily visible to the unaided eye as part of Orion's Sword, south of the three stars of Orion's Belt.
The Tadpole Nebula IC410 lies in the constellation of Auriga and is about 12400 light-years from Earth.
The California Nebula (NGC 1499) is an emission nebula located in the constellation Perseus. It is so named because it appears to resemble the outline of the US State of California on long exposure photographs.
The Horsehead Nebula Barnard 33 or IC 434 is part of a small dark cloud and the Flame Nebula NGC 2024 is an emission nebula in the constellation Orion. Both nebulas are located just to the south of Alnitak, the easternmost star of Orion's Belt.
IC 63 and IC59 are an emission nebula in the constellation Cassiopeia. The bright star is Gamma Cassiopeiae γ Cas.
Messier 78 at the top right and NGC 2071 at the bottom left in the constellation Orion are reflection nebulae and can already be observed with smaller telescopes.
The Iris Nebula (also known as NGC 7023 and Caldwell 4) is a bright reflection nebula in the constellation Cepheus.
A reflection nebula in the constellation Perseus, the Embryo Nebula NGC 1333 is a vast star-forming region of young stars less than a million years old.
Large amounts of interstellar matter can be found in the Cepheus/Cassiopeia region. Here also lies the little-known dark nebula LDN 1251 from the Lynds catalog of dark nebulae.
Barnard 150 is a dark nebula visible in Cepheus constellation. It is also known as the Seahorse Nebula due to its shape.
Top right: Planetary nebulae "Owl Nebula, Messier 97" and Botton left: "Surfboard Galaxy Messier 108"
Galaxies