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Description. Alien is a role-playing game set in space in the far future that has two modes: Campaign: The usual role-playing milieu, where the gamemaster creates a "world" and a plot, then describes a situation or story hook to the players, who then indicate how their player characters react. [1]
In 2013, astronomers using the Kepler space telescope's data estimated that about one-fifth of G-type and K-type stars (sun-like stars and orange dwarfs) are expected to have an Earth-sized or super-Earth-sized planet (1–2 Earths wide) close to an Earth-like orbit (0.25–4 F 🜨), yielding about 8.8 billion of them for the entire Milky Way ...
High-velocity clouds ( HVCs) are large collections of gas found throughout the galactic halo of the Milky Way. Their bulk motions in the local standard of rest have velocities which are measured in excess of 70–90 km s −1. These clouds of gas can be massive in size, some on the order of millions of times the mass of the Sun ( ), and cover ...
For example, the nearest star to the Earth after the Sun is Proxima Centauri, about 4.2 light-years (4.0 × 10 13 km; 2.5 × 10 13 mi) or 30 million (3 × 10 7) solar diameters away. To visualize that scale, if the Sun were a ping-pong ball , Proxima Centauri would be a pea about 1,100 km (680 mi) away, and the Milky Way would be about 30 ...
Sagittarius A*, abbreviated Sgr A* ( / ˈsædʒ ˈeɪ stɑːr / SADGE-AY-star [3] ), is the supermassive black hole [4] [5] [6] at the Galactic Center of the Milky Way. Viewed from Earth, it is located near the border of the constellations Sagittarius and Scorpius, about 5.6° south of the ecliptic, [7] visually close to the Butterfly Cluster ...
The Sagittarius Dwarf Spheroidal Galaxy ( Sgr dSph ), also known as the Sagittarius Dwarf Elliptical Galaxy ( Sgr dE or Sag DEG ), is an elliptical loop-shaped satellite galaxy of the Milky Way. It contains four globular clusters in its main body, [8] with the brightest of them— NGC 6715 (M54)—being known well before the discovery of the ...
By comparison, the total mass of all the stars in the Milky Way is estimated to be between 4.6 × 10 10 M ☉ and 6.43 × 10 10 M ☉. [133] In addition to the stars, there is also interstellar gas, comprising 90% hydrogen and 10% helium by mass, [139] [ unreliable source? ] with two thirds of the hydrogen found in the atomic form and the ...
Orion Arm. The Orion Arm, also known as the Orion–Cygnus Arm, is a minor spiral arm within the Milky Way Galaxy spanning 3,500 light-years (1,100 parsecs) in width and extending roughly 10,000 light-years (3,100 parsecs) in length. [2] This galactic structure encompasses the Solar System, including Earth.