I´ve made a few additions and updates to existing entries on real life astronomical objects
Many of these where lacking text and/or images, so I did some research and also went back to some of my earliest travels to dig out some old images.
This is how the entries look now:
POI Name: Hind Nebula (T Tauri)
POI Type: Planetary Nebula
Game map search ref.: T Tauri
Description: NGC 1555, sometimes known as Hind's Variable Nebula, is a variable nebula, illuminated by the star T Tauri, located in the constellation Taurus. The nebula was discovered on October 11, 1852 by John Russell Hind. It is a yellowish/orange nebula and when viewed from within the T Tauri system, part of the nebula resembles the shape of a bird in flight.
T Tauri itself is a very young pre-main-sequence star in the process of contracting to the main sequence. It is the prototype of the T Tauri stars. These young stars have surface temperatures similar to those of main-sequence stars of the same mass, but they are significantly more luminous because their radii are larger. Their central temperatures are too low for hydrogen fusion. Instead, they are powered by gravitational energy released as the stars contract, while moving towards the main sequence, which they reach after about 100 million years. [Note: In Elite Dangerous T-Tauri is depicted as a G-class main sequence star. It is unkown why this is so.]
The Hind Nebula was the destination of one of the early research voyages organized by the First Great Expedition - making it one of the first nebulae to be surveyed by group exploration.
POI Name: Barnard's Loop (Orion Molecular Complex)
POI Type: Beacon
Game map search ref.: Trapezium Sector AF-Z c0
Description: The Orion Molecular Complex is a region of visually stunning nebulae, all within a few hundred light years radius of each other. Barnard's Loop is the most prominent in this region and acts as a navigational aid to travelers as far afield as the Sagittarius Gap far rim. Deep Space explorers returning from the depths of the galactic core regions know home is ever closer once the tiny but welcoming distant red haze of Barnard's Loop becomes visible through their canopy window.
The loop takes the form of a large arc, more than 300 LY across, and centered approximately on the Orion Nebula. The stars within the Orion Nebula are believed to be responsible for ionizing the loop.
Barnard's Loop is thought to have originated in a supernova explosion about 2 million years ago, which may have also created several known runaway stars, including AE Aurigae, Mu Columbae and 53 Arietis, which are believed to have been part of a multiple star system in which one component exploded as a supernova.
Although this faint nebula was certainly observed by earlier astronomers, it is named after the pioneering astrophotographer E. E. Barnard who photographed it and published a description in 1894.
POI Name: The Horsehead Nebula
POI Type: Nebula
Game map search ref.: Horsehead Dark Region IR-V c2-0
Description: The Horsehead Nebula is a dark nebula in the constellation Orion. When viewed from Earth the nebula is located just to the south of the star Alnitak, which is farthest east on Orion's Belt. It was first recorded in 1888 by Scottish astronomer Williamina Fleming.
The Horsehead Nebula is approximately 1500 light years from Earth. It is one of the most identifiable nebulae because of the shape of its swirling cloud of dark dust and gases, which bears some resemblance to a horse's head when viewed from Earth. The heavy concentrations of dust in the Horsehead Nebula region is highly localized, resulting in alternating sections of nearly complete opacity and transparency. The red or pinkish glow originates from hydrogen gas ionized by the nearby stars.
Exlorers travelling this region has reported on mysterious fluctuating behavior from their nav-computers, at times restricting entry into several systems within the nebula but at other times allowing it. This was first reported as early as november 3300 (
Source).
POI Name: The Orion Nebula
POI Type: Nebula
Game map search ref.: HD 36917
Description: The Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a diffuse nebula situated in the Milky Way, being south of Orion's Belt in the constellation of Orion. It is one of the brightest nebulae, and is visible to the naked eye in the night sky on Earth.
The Orion Nebula contains a very young open cluster, an association of about 2,800 stars within an ellipsoid with a diameter of 20 light years. This stellar nursery, as it is known, contains over 100 known kinds of organic and inorganic gases as well as dust; some of the latter is made up of large and complex organic molecules. In this region is also several notable stars including the white supergiant EZ Orionis.
Observers have long noted a distinctive greenish tint to the nebula, in addition to regions of red and of blue-violet. The red hue is an emmision from ionized hydrogen gases, while the blue-violet coloration is the reflected radiation from the massive O-class stars at the core of the nebula.
The green hue was a puzzle for astronomers in the early part of the 20th century because none of the known spectral lines at that time could explain it. There was some speculation that the lines were caused by a new element, and the name nebulium was coined for this mysterious material. With better understanding of atomic physics, however, it was later determined that the green spectrum was caused by a low-probability electron transition in doubly ionized oxygen, a so-called "forbidden transition". This radiation was all but impossible to reproduce in the laboratory at the time, because it depended on the quiescent and nearly collision-free environment found in the high vacuum of deep space.