The Cone Nebula is an H II region in the constellation of Monoceros. It was discovered by William Herschel on December at which time he designated it H The nebula is located about 830 parsecs or light-years away from Earth.
While most spiral galaxies, including our own Milky Way, have two or more spiral arms, NGC 4725 has only one. In this sharp color composite image, the arm, solo spira mirabilis, seems to wind from a prominent ring of bluish, newborn star clusters and red tinted star forming regions. Astronomers refer to NGC 4725, located 41 million light-years away in the constellation Coma Berenices, as a ringed barred spiral galaxy because a prominent ring of stars encircles a bar of stars at its center.
NGC 2736 (also known as the Pencil Nebula) is a small part of the Vela Supernova Remnant, located near the Vela Pulsar in the constellation Vela. Pencil Nebula in Vela Image Processing by Don Goldman
AAPOD² 9 November 2017 NGC 6888 (Crescent Nebula) bicolor By Luca Moretti http://www.apodx2.com/2017/20171109.html
This image from the NASA/ESA Hubble Space Telescope shows NGC 7026, a planetary nebula. Located just beyond the tip of the tail of the constellation of Cygnus (The Swan), this butterfly-shaped cloud of glowing gas and dust is the wreckage of a star similar to the Sun.