So even though a supernova means a star hasdied, it also marks the birth of elements that support life.阅读短文,从每题所给的A、B、C和D四个选项中,选出最佳选项。The author is describing someoneobservingA. an asteroid(小行星)hiting a planetB. a plant thti dyingC. the Sun outshining ...
depicting X-rays from Chandra, infrared data from Spitzer, and radio data from the Very Large Array and the Australia Telescope Compact Array. Type Ia supernovas can occur when a white dwarf pulls material from a companion star until the white dwarf grows so much that it becomes unstable...
Rusty Marks
To create a supernova, a star needs about 10 times the mass of our sun. An object of that size would form a dense stellar corpse called aneutronstar after the explosion. To leave behind ablack hole, a supernova must occur in a star with about 20 times the mass of the sun. Addition...
SPACE.com: A collision of galaxies sounds violent. Is it? You may like Astronomers discover misshapen galaxy is a cosmic predator that bears 'scars' from its last meal (photo) A gravitational war next door: The Large Magellanic Cloud is gradually destroying the Small Magellanic Cloud ...
(b) Explain briefly why a star burns hydrogen first, instead of helium. What is the main-sequence turnoff point of a star cluster and what does it describe? What causes a star to move off the main sequence? What effect do supernova explosions have on the makeup of interstel...
What is the exact mechanism by which an implosion of a dying star becomes an explosion? What are the characteristics of nuclear fusion? Explain what happens during a lunar eclipse. Why does the Sun appear to have a sharp edge? Explain how supe...
To justify the late time cosmic acceleration detected by the Ia supernova observations [12], one is required to modify either the 'gravity part' or the 'matter/stress energy part' of the Einstein field equation. The latter initiated the idea of modelling dark energy (DE) which is a kind ...
What happens when a star becomes a supernova? Do asteroids have craters? How big was the asteroid impact 65 million years ago? How did hadrosaurs survive the asteroid impact? How many different types of asteroids are there? What are small asteroids called? According to the Nebular Theory what...
What happens to the field if the radius is doubled? a. It becomes four times larger. b. It becomes twice as large. c. It is unchanged. d. It becomes one-half as large. e. It becomes one-fourth as large. Why is soft iron u...