Stars questions

Acctually due to recent research, it appeared that abnormalities in gravitational fields astronomers have predicted that there might be a primordial black hole prevailing in the dust errees near the oort cloud. :SCIENCE FREAK

Dark nebulae are clouds of dust which are simply blocking the light from whatever is behind. They are physically very similar to reflection nebulae; they look different only because of the geometry of the light source, the cloud and the Earth. Dark nebulae are also often seen in conjunction with reflection and emission nebulae. A typical diffuse nebula is a few hundred light-years across. (NGC 2264 shown; see also the Horsehead Nebula)

Coronal holes generally discharge solar wind at a speed about twice the average. The escaping solar wind is known to travel along open magnetic field lines that pass through the coronal hole area. Since coronal holes are regions in the Sun’s corona that have much lower densities and temperatures than most of the corona, these regions are very thin. This thinness contributes to the solar wind since particles within the chromosphere can more easily break through.

Beta Cancri, also named Tarf is the brightest star in the zodiacal constellation of Cancer. It has an apparent visual magnitude of +3.5 and an absolute magnitude of −1.2. Based on parallax measurements obtained during the Hipparcos mission, it is approximately 290 light-years distant from the Sun.

HII region is typically a cloud of partially ionized gas in which star formation has recently taken place, with a size ranging from one to hundreds of light years. H II regions may give birth to thousands of stars over a period of several million years. The Orion Nebula, now known to be an H II region, was observed in 1610 by Nicolas de Peiresc by telescope, the first such object discovered.

SN 2010lt is a supernova located in the galaxy UGC 3378 in Camelopardalis. It was discovered by amateur astronomers Kathryn Gray, her father Paul Gray, of Fredericton, New Brunswick, Canada and David J. Lane of Stillwater Lake, Nova Scotia, Canada. Upon discovery, Kathryn Aurora Gray became the youngest person to ever discover a supernova, being 10 years old when she did so. The previous record was held by the 14-year-old Caroline Moore.

Blue straggler stars are stars in open or globular clusters that are hotter and bluer than other cluster stars having the same luminosity, they rapidly rotate at a rate of 75 times that of the Sun's rotation. Blue stragglers were first discovered by Allan Sandage in 1953 while performing photometry of the stars in the globular cluster M3.

Spörer's law predicts the variation of sunspot latitudes during a solar cycle. It was discovered by the English astronomer Richard Christopher Carrington around 1861. Carrington's work was refined by the German astronomer Gustav Spörer.

Cygnus is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. It is one of the most recognizable constellations of the northern summer and autumn. Its brightest star, Deneb, is one of the vertices of the asterism known as the Summer Triangle and forms the 'head' of the neck-less Northern Cross.

Asteroids are minor planets, especially those of the inner Solar System. They vary greatly in size, from almost 1000 km for the largest down to rocks just 1 meter across. The large majority of known asteroids orbit in the asteroid belt between the orbits of Mars and Jupiter.