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P1 Topic 3: Waves and the Universe
Ancient astronomers made detailed observations of the positions of the stars using the naked eye. Using a
telescope, Galileo Galilei discovered that the Milky Way and some nebulae (Latin word for clouds) were
actually groups of stars. He also suggested that stars and…

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Visible light only occupies a small part of the electromagnetic spectrum so only using that means we'll only
discover an equally small part of the universe.

Telescopes in Space

The Hubble Space Telescope has been orbit around the Earth since 1990. It can produce very sharp and clear
images of…

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Telescopes are improving all the time to give us better resolution and can gather more light so even the
faintest objects can be seen.
Discovering galaxies is important to help scientists learn more about their life cycle. Some pictures taken by
the Hubble Space telescope show galaxies at different stages…

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4. After about 10 billion years, the hydrogen in the core begins to run out and the star then swells into a red
giant (it becomes red as the surface cools). It expands as the core of the star is not hot enough to withstand
the gravity and collapses, expelling…

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but realised it was the radiation predicted by the Big Bang theory.
The theory states that huge amounts of radiation were released at the beginning of the Universe and is still
detectable as microwave radiation today (it decreased in frequency over time).
Red-shift supports both theories as both say the…




thxs:D very useful

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