The birth of a star beginswhen massive clouds of dust and gas start to collapse and break down. How does thishappen? It happens through the force of gravity.Gravity bounds the elements together to create a protostar. The protostar isbasically a baby star, and grows into a star through its...
Hubble's Law is a major piece of evidence that the universe is expanding — his work formed the basis of the big bang theory of the origin of the universe. The Doppler Effect Much like the high-pitched sound from a fire-truck siren gets lower as the truck moves away, the movement of...
Over time, as the protostar draws in more material and heats up further, things reach a tipping point. When enough mass (think about 0.1 times the mass of our ownsun) collapses into the protostar, it experiences a dramatic and fiery transformation. Massive gas jets erupt, clearing away the ...
How do stars heat up before they begin nuclear fusion? For example, how does a protostar gain enough heat to begin nuclear fusion? When binary fission is complete? What is the role of electrical forces in nuclear fission? Calculate the energy released in the fission reaction n + ^{235}_{...
C.How dust grains and gases were formed after the Big Bang. D.How the first stars canle into being after the Big Bang. 33.What does the"astronomical object"in paragraph 2 refer to? A.cosmic dark ages. B.dust grains and gases. C.a protostar. D.the early universe. 34.Accordin...
ALMA also found complex organic chemistry around V883 Orionis, a star in the constellation Orion. V883 Ori is a protostar that recently had an outburst, sending a wave of heat pulsing through the protoplanetary disk surrounding it. This thermal wave caused organic molecules to sublimate from icy...
Within 50 million years, the pressure and density of hydrogen in the center of the protostar became great enough for it to begin thermonuclear fusion. The temperature, reaction rate, pressure, and density increased until hydrostatic equilibrium was achieved. At this point, the Sun became a main-...
one of the most massive stars can be formed in the same way as its less massive relatives: through mechanisms which are the same as those of less massive stars despite differences in scales and in timing; and with matter which is funneled onto the growing infant star by a Keplerian disk...
Visual culture – and the associated forms of symbolic communication, are regarded by palaeo-anthropologists as perhaps the defining characteristic of the behaviour of Homo sapiens. One of the great mysteries of archaeology is why figurative art, in the
Our sun was but a fledgling protostar, continually amassing more matter via gravity and steadily cranking up its internal nuclear fusion. There was no solar system, only a giant, rotating cloud of particles called the solar nebula. To figure out how all that leftover gas and dust led to ...