Stars and Black Holes: Stars A star is a massive, luminous ball of
... There are _____________ of galaxies in the ______________. Galaxies are ________________: they contain ________, ___________, and _______. The farthest galaxies and the stars we see shining in them may be also the _____________ because it takes the _____________ so long to reach us. ...
... There are _____________ of galaxies in the ______________. Galaxies are ________________: they contain ________, ___________, and _______. The farthest galaxies and the stars we see shining in them may be also the _____________ because it takes the _____________ so long to reach us. ...
National Geographic “Space Quest” Notes
... Axis - line about which a rotating body such as Earth turns Galaxy – system of stars Gravity – pulling force that all objects have Rotation – act of turning around a center Star - body of hot gases that gives off energy Telescope – device used to study distant objects. It takes the Earth 24 hours to ...
... Axis - line about which a rotating body such as Earth turns Galaxy – system of stars Gravity – pulling force that all objects have Rotation – act of turning around a center Star - body of hot gases that gives off energy Telescope – device used to study distant objects. It takes the Earth 24 hours to ...
Document
... 170,000 Years ago a star explodes in a small nearby galaxy known as the Large Magellanic Cloud that lies just beyond the Milky Way. The star, known in modern times as Sanduleak 69202, was a blue supergiant 25 times more massive than the Sun. Such explosions distribute all the common elements such as ...
... 170,000 Years ago a star explodes in a small nearby galaxy known as the Large Magellanic Cloud that lies just beyond the Milky Way. The star, known in modern times as Sanduleak 69202, was a blue supergiant 25 times more massive than the Sun. Such explosions distribute all the common elements such as ...
Universe, Earth, and The Solar System Characteristics of Stars
... Characteristics to classify stars include color, temperature, size, composition, and brightness. The brightness of a star depends upon both its size and temperature. Scientists use light years to measure distances between stars. ...
... Characteristics to classify stars include color, temperature, size, composition, and brightness. The brightness of a star depends upon both its size and temperature. Scientists use light years to measure distances between stars. ...
Chapter 4 Vocabulary
... the process in which particles of an element collide and combine to form a heavier element ...
... the process in which particles of an element collide and combine to form a heavier element ...
H II region
An H II region is a large, low-density cloud of partially ionized gas in which star formation has recently taken place. The short-lived blue stars forged in these regions emit copious amounts of ultraviolet light that ionize the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds. The first known H II region was the Orion Nebula, which was discovered in 1610 by Nicolas-Claude Fabri de Peiresc.H II regions are named for the large amount of ionised atomic hydrogen they contain, referred to as H II, pronounced H-two by astronomers (an H I region being neutral atomic hydrogen, and H2 being molecular hydrogen). Such regions have extremely diverse shapes, because the distribution of the stars and gas inside them is irregular. They often appear clumpy and filamentary, sometimes showing bizarre shapes such as the Horsehead Nebula. H II regions may give birth to thousands of stars over a period of several million years. In the end, supernova explosions and strong stellar winds from the most massive stars in the resulting star cluster will disperse the gases of the H II region, leaving behind a cluster of birthed stars such as the Pleiades.H II regions can be seen to considerable distances in the universe, and the study of extragalactic H II regions is important in determining the distance and chemical composition of other galaxies. Spiral and irregular galaxies contain many H II regions, while elliptical galaxies are almost devoid of them. In the spiral galaxies, including the Milky Way, H II regions are concentrated in the spiral arms, while in the irregular galaxies they are distributed chaotically. Some galaxies contain huge H II regions, which may contain tens of thousands of stars. Examples include the 30 Doradus region in the Large Magellanic Cloud and NGC 604 in the Triangulum Galaxy.