Preparation of directory for each sentence (SSC-01 to SSC-23)

data/SSC-13/SSC-13-EN.txt

+Within these populations, some objects are large enough to have rounded under their own gravity, though there is considerable debate as to how many there will prove to be.

data/SSC-14/SSC-14-EN.txt

+Such objects are categorized as dwarf planets.

data/SSC-15/SSC-15-EN.txt

+Astronomers generally accept at least nine objects as dwarf planets: the asteroid Ceres and the trans-Neptunian objects Pluto, Eris, Haumea, Makemake, Gonggong, Quaoar, Sedna, and Orcus.

data/SSC-16/SSC-16-EN.txt

+In addition to these two regions, various other small-body populations, including comets, centaurs and interplanetary dust clouds, freely travel between regions.

data/SSC-17/SSC-17-EN.txt

+Six of the planets, the six largest possible dwarf planets, and many of the smaller bodies are orbited by natural satellites, usually termed "moons" after the Moon.

data/SSC-18/SSC-18-EN.txt

+Each of the outer planets is encircled by planetary rings of dust and other small objects.

data/SSC-19/SSC-19-EN.txt

+The solar wind, a stream of charged particles flowing outwards from the Sun, creates a bubble-like region in the interstellar medium known as the heliosphere.

data/SSC-20/SSC-20-EN.txt

+The heliopause is the point at which pressure from the solar wind is equal to the opposing pressure of the interstellar medium; it extends out to the edge of the scattered disc.

data/SSC-21/SSC-21-EN.txt

+The Oort cloud, which is thought to be the source for long-period comets, may also exist at a distance roughly a thousand times further than the heliosphere.

data/SSC-22/SSC-22-EN.txt

+The Solar System is located 26,000 light-years from the center of the Milky Way galaxy in the Orion Arm, which contains most of the visible stars in the night sky.

data/SSC-23/SSC-23-EN.txt

+The nearest stars are within the so-called Local Bubble, with the closest, Proxima Centauri, at 4.25 light-years.