1. dark matter: the force that holds stars in the sky. it can be proven in several ways: dark matter neither absorbs or emits light, scientist can observe it by measuring the effects of its gravity. this can be easily seen when two galaxies collide. Scientist use special telescopes to detect the location and amount of mass during the collision. Most of this mass is hot gas, which is the energy emitted during the collision. The other majority of mass is stars. All of this mass is contained in the galaxies. However, the force of dark matter keeps the stars (visible matter) separated. This dark matter is directly related to dark energy (the force that is propelling the universe’s expansion).
2. DARK ENERGY:
how can we know how big the universe is? we observe white dwarfs (the standard for light in the universe) to see how much light they emit. [“Because all white dwarfs achieve the same mass before exploding, they all achieve the same luminosity and can be used by astronomers as “standard candles.”” (NASA)] By observing the light we can conclude their distance (using the 1/r2 law). By knowing the distance, we can know how long ago they occurred, by looking at their wave length and intensity of light. When scientists searched for these supernovae they expected that the expansion of the universe would be slowing (stars would be brighter–closer to us) but instead the supernovae was much dimmer, suggesting that they are father away… hence the conclusion of THE UNIVERSE IS GROWING!
3. Cosmic Microwaves (not just for popcorn): cosmic microwave background indicate that the Universe has a flat geometry. Except there is not enough matter in the universe to produce this plain. Dark energy is the “stuff” that must fill the vast reaches of mostly empty space in the universe in order to be able to make space accelerate in its expansion. In this sense, it is a “field” just like an electric field or a magnetic field, both of which are produced by electromagnetic energy.
4. however, there must be something more propelling the universe. if scientist measure the supernovae from the beginning of the universe, then there are other stars beyond those, which our telescopes cannot see. this would lead me to conclude there is a black hole from the first gravitational collapse of a star, when our universe was only a few million of years old. This star would have been massive, larger than any star we know of today (Pistol Star is the largest). It’s mass would result in a huge supernova and BAM the primordial black hole. …
beginnings and endings
Did this article help you?
If you found this piece useful, please consider supporting our work with a small, one-time or monthly donation. Your contribution enables us to continue bringing you accurate, thought-provoking science and medical news that you can trust. Independent reporting takes time, effort, and resources, and your support makes it possible for us to keep exploring the stories that matter to you. Together, we can ensure that important discoveries and developments reach the people who need them most.
Comments are closed.