Birth of a star

545 views
264 views

Published on

Published in: Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
545
On SlideShare
0
From Embeds
0
Number of Embeds
22
Actions
Shares
0
Downloads
7
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Birth of a star

  1. 1. Juan Carlos Acosta English V: Listening & Speaking Mario Guerrero BIRTH OF A STAR University of Nariño
  2. 2. What is a star? A star is a giant luminous ball of super heated gas. Just like our star, The Sun. They are scattered throughout the space so far away, that we would need one hundred thousand years to reach them.
  3. 3. How are stars born? They begin in clouds of dust and gas very far away. Gravity gathers hydrogen gas and particles of dust and the clouds grow more dense. As it squeezes itself tighter, the hydrogen heats up to a fantastic 18 million ºF (10 million ºC). Nuclear fusion turns hydrogen into helium and the fire ignites.
  4. 4. Where are stars born? Stars are born in vast clouds in the space called nebulae. A nebulae is an interstellar cloud of dust, hydrogen, helium and other ionized gases. These clouds are also called molecular clouds. Here, temperatures can drop down until -441 ºF (-263 ºC).
  5. 5. What color are stars? The color of stars depend on how hot they are. The temperature varies along a band on a graph called the Main Sequence. The colors go from hot and bright blue-white to cool and dim red.
  6. 6. What is the biggest star? The biggest stars are the supergiants. Antares is 700 times as big as the Sun. The largest star we know of, is called VY Canis Majoris. We could probably fit the Sun inside VY Canis Majoris 2100 times.
  7. 7. How many stars are there? What makes stars twinkle? Stars twinkle because the Earth’s atmosphere is never still. Starlight twinkles as the air wavers. It is hard to know how many stars there are in the universe. But astronomers guess there are about 200 billion billion. What makes stars glow? They glow because the enormous pressure deep inside generates nuclear fusion reactions.
  8. 8. THANK YOU…

×