... Nayakshin Sergei, Sunyaev Rashid "The `missing' young stellar objects in the central parsec of the Galaxy: evidence for star formation in a massive accretion disc and a top-heavy initial mass function", Monthly Notices of the Royal Astronomical Society ...
... Lunar calendar--Metonic and Moslem. 7 Precession of the Earth, shift of pole star . Milankovich theory of ice ages. ... Why existence of horizon suggests the Earth curves. 8b, 8d Parallax, and its use estimating distances--to Moon, Stars, outdoors ...
... 2002, 17 October---Following strong early hints of a black hole at the center of our galaxy, observations are reported on a star's orbit around it, suggesting the black hole has the mass of 3.7 million suns. ...
... The web site shows the ellipse of a star orbiting the cente r once in 15.2 years, and calculations deduce a mass of about 3.7 million suns, give or take 1.5 millions. ...
... Imagine yourself standing at night at point P on Earth and observing the pole star (or better, the position of the north celestial pole, near that star), at an elevation angle h above the horizon. ...
... known satellites: orbit : 128,000 km from Jupiter diameter : 40 km mass : 9.56e16 kg ... orbit : 129,000 km from Jupiter diameter : 20 km (23 x 20 x 15) mass : 1.91e16 kg ...
... Uranus is larger in diameter but smaller in mass than Neptune . ... 19.218 AU ) from Sun diameter : 51,118 km (equatorial) mass : 8.683e25 kg C areful ... before but ignored as simply another star (the earliest recorded sighting was in ...