This week we learned about WWI. I like history and WWI so it was interesting. Some things I didn’t like was how slow everything felt. I would like it if we went faster through the unit. It feels like I’m just being fed the same information over and over again. Some things I liked were learning more about the alliances that brought everyone into the war. Although there were some things I didn’t like I’m looking forward to learn what goes on during the war next week.
In the last we have learned about things like birth rates compared to poverty, the poverty cycle, how to reduce food waste, and more. I liked learning about climate change more. It was interesting to see how many tons of greenhouse gases certain industries produce. Some ways we created greenhouse gases was indirect by buying electricity from places like the US and Alberta and I thought that was interesting. In general I liked this unit, but there were things that I thought were useless to learn. For example we were taught about what we can recycle. On the surface this seems like a good idea, but I think people don’t change without consequences or insensitives and educating people about this won’t make them recycle. Even if this had gotten more people to recycle the waste a from average people created in a household is such a tiny percentage of our waste and if all of us recycled perfectly it would be a positive but I think we should focus on bigger contributors to greenhouse gases and waste.
Currently in Canada we have a first past the post voting system. I like the current system and I think it has a lot of benefits. One thing that it does well are representing ridings better than other systems. Each riding always has the representative that is best aligned with majority of the people’s beliefs. These individual representatives make up a bigger government. Each representative will push for what their riding wants. I think this is fair because ridings will get better representation in government than other voting systems. A downside is that it is possible that a portion of the population votes for one party but they are not represented proportionally in ridings won.
Another voting system is mixed-member proportional this is a system where there are elements of first past the post and proportional representation. If not first past the post I would choose this system because it is better than first past the post for total representation of the country but it’s not as good at riding representation. It would make it so MLA’s would be voted in by people voting for their party as well as being voted in from their riding. However it is a compromise between the two and I think that the first past the post system represents the country well enough while also doing the best job of representing ridings.
What is dark matter and dark energy and why is it speeding up the expansion of the universe?
Why scientists think dark matter and dark energy exist.
Dark matter is a form of matter that scientists hypothesis exist. Scientists Thought dark matter had to exist because when looking at galaxies the force of gravity should be less the farther away from the center of the galaxy the star is so the orbit speed around the galaxy should be considerably slower for a star near the outside of the galaxy but when looking at outer stars in galaxies they don’t go as slow as they should this suggests that there is something around the galaxy making the stars move faster. This didn’t seam correct, Newtons theory about gravity didn’t explain why the stars were moving that fast Instead of suggesting that newton was wrong they thought that the reason must be that there is a type of matter that does not emit or reflect light but still has mass and can pass through normal matter. It turns out there is and they called it dark matter. A way scientists can observe dark matter is by looking at light that is bent by the gravity of clusters of galaxies, by looking at how much the light around the cluster is bent they can tell how much mass a cluster has and where the mass is located when the mass is mapped out it shows that there is mass within the cluster that is emitting no light showing that there is dark matter. Scientists can tell the amount of dark matter differs depending on which galaxy scientists look at as well. The force that dark matter creates changes based on how much dark matter is present. Dark energy was hypothesized because the universe seemed to be expanding and a energy that is present throughout space could have been a possible reason why.
Scientists think there is dark matter as well as some kind of energy that works in opposition to gravity or as its commonly known dark energy. Scientists calculated that there should be about 5 times more dark matter than regular matter and about 14 times more dark energy. Dark matter is thought to possibly be particles called axions which don’t emit light but have mass and also are able to pass through normal matter however these particles are still hypothetical. What we know for sure about dark matter is that it it interacts with gravity like normal matter does and that it makes galaxies and other things stay together when they form. We also know there is a lot of it. Dark energy on the other hand has less known about it. Not all scientists agree on what it is but most do agree that it is constant throughout the universe. Some think that it is just a property of space expanding others think that it is a force that works in opposition to gravity.
What do scientists think is speeding up the expansion of the universe?
originally scientists thought because of gravity the universe would collapse back into itself. After realizing the universe was expanding more and more scientists didn’t and still don’t really know why it is. Some think its dark energy others just think its a property of space expanding and some think dark energy is particles popping in and out of existence. However whatever is speeding the expansion up has more energy than everything else in the universe.
I used a lot of videos for my resources when researching. Most videos were created by PBS and a few from channels like crash course and kurzgsagt. I have linked the two videos above and I have also taken my research from these videos:
I believe that what is causing the expansion of the universe and it speeding up is that empty space always has dark energy that does not get weaker as it expands (This Idea is also really well laid out in the third link in the resources section). The expansion of space is where I think the energy is coming from. As time continues the more space expands increasing the total dark energy making the universe expand quicker and quicker at an ever increasing rate.