Class Masters/Prepared Speech-What is Dark Matter?

Cue Cards:

  • Hello
  • What
  • What do
  • How much universe
  • Who first to find out about it


  • D.M hypothetical form matter invisible doesn’t emit absorb light
  • Has gravitational effect means
  • How exerts helps gravity keeps stars together orbit


  • Effect makes detectable
  • Probably wondering how much in universe
  • Surprisingly, 4 times more common normal matter-visible, e.g.
  • Reason 4 times more common spread space-can’t see


  • Exact amount universe unknown estimates range approx. 25% to approx. 95%
  • First suggest existence Dutch astronomer Jacobus Kapteyn 1922


  • Also known extensive studies Milky Way
  • But back dark matter
  • He used evidence stellar velocities
  • Stellar velocities speeds stars orbit


  • Others undertaken related studies such as Jan Oort + Fritz Zwicky
  • Something like the cryogenic dark matter detector-Iron Mine-Minesota which in U.S.A is focussed on dark matter


  • Also, telescopes designed specifically evidence dark matter on earth + in space
  • We’re coming end so conclusion hope enjoyed,+ learned things-D.M
  • Thank you


In preparation for my speech some difficulties I faced were finding some meaningful information about Dark Matter that I understood well. Some of the information I found was a bit technical and in adult language. Another difficulty that came up while preparing my speech was actually finding some juicy background information about Dark Matter because I could’ve answered my question in just a few sentences but I had to fill in time with other relevant info.

The strong points of my presentation were the actual presentation. I was very confident and proud. I understood what I was talking about because I could confidently answer questions about it without checking my cue cards. I also think the order of my information was set out well. I transitioned from each subject and tried to engage the audience in such a scientific matter.

Some work habits I could change to achieve higher results next time are getting my speech organised early so I don’t leave it to the last minute and produce a less organised and practised speech than I could’ve. Maybe I also could’ve tried to fit more in to my speech to make it better because I had an extra 30 seconds.

I could use my skills of speaking and listening in debating because debating is all about speaking and listening to others’ points. I could also use these skills for impromptu/spontaneous speeches. This will be done later in the year so it’s good to be ready for it.

Here are 5 things that were done well (throughout the class):

-We didn’t use too much scientific language and when we did we explained it clearly

-We used clear pictures/graphs and explained them

-We researched well and found relevant info to follow up with explanatory answers

-Our cue-cards were just to give us an idea so we weren’t reading straight off them but speaking to the audience

– We had a fair amount of eye-contact and didn’t check our cue-cards too often

Here are 3 things to avoid when public speaking:

-Don’t look at just one person so try and look and speak to everyone

-Don’t read straight off a sheet so try and speak instead of read to the audience

-Don’t go on too much and go off on a tangent so try to keep everything relevant to the subject

Here are 3 personal goals for future presentations:

-To memorise the speech mostly so I can focus on other aspects of the speech like eye-contact and hand gestures

-To order my sub-topics in a way that each one follows on from each other and transitions well

-To relate my topic to the audience so it’s clearer and easier for them to relate to and understand