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Dark Energy

Coming next Class

REVIEW

Dark Matter

PE = mgh

KE = 1/2 mv^2

a little review

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Holly Patraschuk, Teri Wang & Éloïse Faehndrich

HOW DO WE KNOW THAT WE DON'T KNOW

WHAT IT'S NOT

Key words to watch for: Red shift, wavelength,

spectrum

ddddd

Last class...lasses

Doppler effect

LLight is more abstract, so let's try explaining it with sound waves

Light emitted by distant galaxies shifts towards the red end of the electromagnetic spectrum as it travels through space

SSo if getting further away is red shift, what colour shift would it be if something was coming towards us?

SS

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How do we know we don't know something?

There is 5x as much dark matter as regular matter

But even failed experiments tell us something...

What Dark Matter is not:

Scientist have many hypothesises on what dark matter could be, but

we still do not know!

Not Clouds of Matter with No Stars

Not Clouds of Matter with No Stars

How do we know? It would emit particles that we could detect.

Image Credit: Hubble Space Telescope NASA, ESA, and STScI

Not Anti-Matter

(Image credit: NASA's Goddard Space Flight Center)

How do we know? Because anti-matter produces unique gamma rays when it reacts with normal matter.

Not Made Up of Black Holes

How do we know? Black holes are very compact objects that violently affect their surroundings but we keep finding dark matter everywhere!

Not Made Up of Black Holes

Credits: NASA/CXC/M.Weiss

Conclusion

There is something

What do we know about dark matter?

CONCLUSION

It interacts with gravity

This is a map of dark matter connecting two galaxies (shown in red) created in 2018 from the University of Waterloo in Ontario!

There is a lot of it

Code 4672 3382

Our Elders believe that what is above is mirrored below and this is our connection with misewa – all that is.

There are stories and teachings that are known and stories and teachings yet to be found. - Wilfred Buck is from the Opaskwayak Cree Nation of Northern Manitoba, Science Specialist

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