Издательство: | Книга по требованию |
Дата выхода: | июль 2011 |
ISBN: | 978-6-1320-2516-6 |
Объём: | 96 страниц |
Масса: | 166 г |
Размеры(В x Ш x Т), см: | 23 x 16 x 1 |
High Quality Content by WIKIPEDIA articles! Xi Draconis is a star in the constellation Draco. It has the traditional name Grumium. Xi Draconis has apparent magnitude +3.75 and is of spectral class K2-III. It is approximately 113 light years away from the Earth. A star is a massive, luminous ball of plasma held together by gravity. The star nearest to Earth is the Sun, which is the source of most of the energy on Earth. Other stars are visible in the night sky, when they are not outshone by the Sun. Historically, the most prominent stars on the celestial sphere were
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