Tex

Life and Death of a Star

t3

How long a star lives depends on how long the star takes to use the hydrogen in its cor...
Supernova

Nova

White Dwarf
The star in the center of
the nova continues to
collapse. It becomes a hot,
dense, white star...
Tex
Structure : Subject and verb Agreement

t2

Rule 1
Two singular subjects connected by“ or ” require a singular verb.
E...
Tex

Vocabulary

t1

red giant

[n.]a very large star of high luminosity and
low surface temperature. Red giants are
thoug...
supergiant
[n.]a very large star that is even brighter
than a giant, often despite being relatively
cool.

Supernova
[n.] ...
[n.]the apportionment of financial liability
resulting from loss of or damage to a ship or
its cargo.

out ward
[v.]connec...
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ใบความรู้ Life and death of a star.ppp

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ใบความรู้ Life and death of a star.ppp

  1. 1. Tex Life and Death of a Star t3 How long a star lives depends on how long the star takes to use the hydrogen in its core. Stars that are small or average in mass, such as the sun, shine for about 10 billion years. The most massive stars live for only about one million years because they use up their hydrogen more quickly. Nebula Massive Stars Mid-Sized Stars A stars that is 10 to 30 times more massive than the sun spend most of its life as a blue star. It glows blue for about 1 to 20 million years. A small or mid-sized star like the sun spends most of its life as a yellow star for about 10 billion years. Supergiant Like a red giant, the star expands. However, because the star is so massive, fusion continues more steadily. A supergiant forms. Red Giant Once a star has changed all the hydrogen into helium, the outward force caused by fusion no longer balances the inward pull of gravity. The star begins to collapse. Then helium nuclei fuse into move massive elements such as carbon. The energy produced by this fusion expands. The star’s surface. The star becomes a bigger, cooler red giant. This change won’t happen to the sun for another 5 billion years. Supernova Nova The supergiant continues to swell. Then gravity pulls the outer parts of the star toward the center. Pressure and temperature increase so much that the star explodes---supernova The red giant collapses as again pulls the outer parts of the star toward the center. Pressure and temperature increase. The outer layers of the star expand to form a nova.
  2. 2. Supernova Nova White Dwarf The star in the center of the nova continues to collapse. It becomes a hot, dense, white star called a white dwarf. Black Dwarf When a white dwarf uses up its energy, it becomes a dark, dense star that no longer shines---a black dwarf. Black Hole Neutron Star
  3. 3. Tex Structure : Subject and verb Agreement t2 Rule 1 Two singular subjects connected by“ or ” require a singular verb. Example : A small or mid – sized starlike the sun spends most of its life as a yellow star. Rule 2 As a general rule, use a plural verb with two or more subject when they are connected by “and” Example : Pressure and temperature increase. Rule 3 Present simple - Subject is singular, verb is also singular s, es Example : The star is so massive. - Subject is plural, verb is also plural. Example :They use up their hydrogen more quickly. Rule 4 Subject which is always plural form such as nuclei. Example : Then helium nuclei fuse into more massive element such as carbon.
  4. 4. Tex Vocabulary t1 red giant [n.]a very large star of high luminosity and low surface temperature. Red giants are thought to be in a late stage of evolution when no hydrogen remains in the core to fuel nuclear fusion. Nova [n.]Star that suddenly becomes much brighter for a short period. white dwarf [n.]a small very dense star that is typically the size of a planet. A white dwarf is formed when a low-mass star has exhausted all its central nuclear fuel and lost its outer layers as a planetary nebula. Mid-sized star [n.]A small or mid-sized star like the sun spends most of its life as a yellow star. massive star [n.]A star that it 10 to 30 times more massive that the sun spends most of its life as a blue star.
  5. 5. supergiant [n.]a very large star that is even brighter than a giant, often despite being relatively cool. Supernova [n.] a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass. Nebula [n.]Astronomy a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter. Neutron star [n.] Is a type of staller remnant that result from the gravitational collapse of a massive star during Type II, Type Ib or Type Ic supernova event. Black hole [n.] a region of space having a gravitational field so intense that no matter or radiation can escape. Average
  6. 6. [n.]the apportionment of financial liability resulting from loss of or damage to a ship or its cargo. out ward [v.]connected with the way people or things seem to be rather than with what is actually true. helium [n.] is a with symbol He and atomic numberIts boiling and melting points are the lowest among the elements and it exists only as a gas except in extreme conditions.

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