Explain how we know of which materials stars are made.
Explain why it is important
to observe the universe with satelites instead of telescopes for example.
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HUBBLE TELESCOPE
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Dark matter
Not visible except through gravity.
New map where we find these in the universe
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Two new moons of pluto were discovered.
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Protoplanetary discs
- Possibility of life outside of earth is more probable than we think.
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Gamma rays
Huge explotions, where more enery is released than what our sun emits in 10 billion years AND
it happens with elements of a low mass, like hydrogen and helium.
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Comet shoemaker
Collided with the planet Jupiter in 1994
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Dark matter
The universe keeps on expanding, and 74% is dark energy...
The term can not yet be fully explained
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Alien worlds ??
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Looking at the stars
How did astronomers gather all the information they have about the universe if stars are simply white sparkles in the night sky?
They make observations in
all areas of the electro-
magnetic spectrum
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Determining materials
If certain colours are omitted in the spectrum of a star, you can determine of which materials the star is made. For example the spectrum of the sun is...
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Extraterrestrial forms of life?
An important condition for this would be the presence of water.
This can be recognised because certain
colours are missing from the IR radiation.
From earth this can not be observed
(too much water vapour in the air).
That is why satallites investigate the infrared spectrum.
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Radiotelescopes
Receives radio waves and
microwaves from the universe.
X-rays can also not penetrate the water vapour in the air and therefore is also investigated by satellites.
X-rays
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Do the following questions:
61 to 64 (p. 50)
In your writingbook
Rules:
- 6 minutes
- No talking
Finished early: look for more important discoveries of the HUBBLE telescope on the internet.
timer
6:00
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In a nutshell:
Black lines in the spectrum reveal the presence of certain substances.
The vapour in the air blocks much
radiation, and therefore satellites are useful in observing the universe
Lesduur is: 50 min
