Transcript Sky Science

SKY SCIENCE
THE SUN AND STARS
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The Sun is the star at the centre of our solar
system
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Our sun is burning hydrogen at a rate of more
than 1 million tonnes per second and turning
that hydrogen into helium. By fusing the atoms
together, the sun produces heat and light which
radiate outward.
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The surface temperature of the sun is about
5000°C. The Sun is a stable star and should
have enough fuel to last another 4-5 billion
years.
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Stars are the heat sources of the universe and
come in all sizes, colors, compositions and
temperatures.
Student Booklet: Page 80, 79, 81
BLACK HOLES
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Black Holes are stars with gravity so
strong that nothing can escape from it, not
even light!
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Anything that passes close to the Black
Hole will be sucked in and will never get
out.
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Black holes cannot actually be seen but
astronomers can find them by looking
indirectly. A black hole pulls in matter from
nearby stars. As the matter disappears, it
sends out strong bursts of x-rays.
Astronomers can detect these x-rays.
Student Booklet: Page 82
THE MILKY WAY
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Our Sun is one of about 200 billion stars in our galaxy – The Milky Way.
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We can not see what our galaxy looks like, but astronomers use its size, mass, gravitational
attraction to conclude that it is most likely similar to our closest neighbor the Andromeda galaxy.
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The Milky Way is only one of billions of galaxies within the viewing range of the larger modern
telescopes.
CONSTELLATIONS
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Constellations are clusters of stars that form a picture. It’s like making a
picture by connecting the dots.
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Constellations get their names from Greek Mythology.
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We can use constellations to help us locate special stars.
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Since the Earth is tilted at 23.5 degrees, we experience the seasons but
also changes in which constellations we see.
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Some constellations are seen year round which are known as
circumpolar. For Ex. Ursa Major, Ursa Minor
Student Booklet: Page 83, 80,
HOW DOES THE EARTH MOVE?
How many of you think we are sitting still?
• At this moment, the Earth is turning on its axis at approximately 1700 km/h
• The Earth orbits the sun at over 100 000 km/h.
Let’s
Investigate!
Student Booklet: Page 69, 70
SHADOWS
SHADOWS
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They come in different sizes and shapes
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They will only appear when there is light (Real or Artificial)
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The size of shadows depends on the closeness of the source of light
Student Booklet: Page 92, 93
SOLAR SYSTEM
Student Booklet: Page 74, 16, 15, 17, 18, 20, 19, 21, 76, 77
PHASES OF THE MOON
RESEARCH AWAY INTO SPACE…
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