Top 10 stars facts Selected as the most interesting among astronomy related questions in Astronomy quiz Which direction was the camera pointing at while taking this picture?North. The entire celestial sphere seems to rotate slowly around the North-South axis of Earth's rotation. So the camera must have been pointed North or South, depending on the hemisphere the photo was taken at. But the bright star in the center must be Polaris, as the south celestial pole currently lacks a bright star to mark its position. Created by: globalquiz.orgphotography facts » What is the densest substance in the universe?Neutron star. A neutron star is a stellar remnant of a supernova. Neutron stars are very small, but extremely dense - with a radius of only about 12–13 km (7 mi), they can have a mass of about two Suns.Created by: globalquiz.orgphysics facts » What is the source of the most powerful release of energy in the universe, second in scale only to the Big Bang?Gamma-ray bursts are the brightest in the universe, even brighter than the glare of quasars, second only to the brightness and power of the Big Bang. It is believed that arise during disruption of stars by black holes.Created by: Krzysztof Moskalastronomy facts » Stars of which type are the smallest in diameter?Neutron stars. A typical neutron star has a mass between about 1 and 2 solar masses, with a corresponding radius of just about 12 km. Some of them (pulsars), rotate as quickly as once per 33-millisecond, so their radius must be very small not to break the light speed limit at the surface level.Created by: Hà Linh Chitechnology facts » How many typical stars can supernova be luminous as?One hundred billion stars. Supernovae are extremely luminous and often briefly outshine an entire galaxy. No supernova has been observed in the Milky Way since 1604, but they are often observed in distant galaxies.Created by: globalquiz.orglight facts » Which star is called the "Dog Star"?Sirius (also known as dog-days, the Dog Star, and α CM) is the brightest and one of the closest stars of the night sky, located in the constellation Canis Major (Latin for "Great Dog").Created by: Krzysztof Moskaldogs facts » What is the stellar day?23 h 56 min 05 s. Sidereal time is a time-keeping system astronomers use to keep track of the direction to point their telescopes to view a given star in the night sky. It is a time scale that is based on the Earth's rate of rotation measured relative to the fixed stars rather than the Sun. Created by: Krzysztof Moskaltime facts » Which stars live the longest in the universe?Little stars. Large and super-massive stars rapidly burn out. The lifetime of the blue supergiant is only a few tens of millions of years. Meanwhile, the small red dwarfs emit small amounts of energy and burn out very slowly - it is estimated that they may shine through the hundreds of billions of years.Created by: Krzysztof Moskalastronomy facts » What star sign would you be if you were born on the 1st of Januray?Capricorn. The zodiac system was developed in Babylonia, some 2,500 years ago. Since then, the zodiacal signs and the constellations associated with them are drifting apart due to the precession of equinoxes with a clockwise (westward) precession of 1.4 degrees per century. For Western astrology, this means that the tropical sign of Aries currently lies somewhere within the constellation Pisces.Created by: globalquiz.orgastronomy facts » The closest star to Sun is Proxima Centauri. In which direction we would need to look to see it on the night sky?It is not visible at all. Proxima Centauri is a red dwarf and its average brightness is very low. That is why even though it is closest to Sun, it was discovered not until in 1915.Created by: Inestechnology facts » Play astronomy quiz and see all the questions.