The universe is very big. It could be infinite, we aren't sure exactly how big it is because it is still growing. It is home to countless stars, planets, galaxies, and nebulae. Everything is so far apart. For instance, our moon is 238,900 miles away from the Earth. It is about twice as many miles that someone might walk in eighty years, assuming they walk about 7,500 steps every day. The closest galaxy to us is the Andromeda Galaxy, it is approximately 2.9 million light years away.
As long as humans have been alive they have questioned and tried to explain the purpose of the visible pieces of the universe. Egyptians thought that the sun god, Ra, had to deal with the universe and how it “reincarnates”. The Chinese made pictures of the stars …show more content…
We can only see 13.8 billion light years in one direction. This happens because the light from beyond that point hasn’t reached us yet. It keeps growing at the speed of light. The speed of light is approximately 186,282 miles per second. An important part of our visible universe are stars. A star is born when atoms of light elements are squeezed under enough pressure for their nuclei to undergo fusion. All stars are a result of force: the force of gravity compresses atoms in interstellar gas until the fusion reaction begins. Stars come in different sizes. The smallest star is called the M- type or the M star. They are just big enough to initiate nuclear fusion at its core. If they were smaller, they would be brown dwarfs, substellar objects but still many times bigger than the biggest planet in our Solar System, Jupiter. They can live for around one hundred billion years With increasing mass stars start to change in size, luminosity, and color. Our sun is considered a G star. It is a small medium size. It is bigger than M-stars and K-stars, but smaller than F, A, B, and O stars. Its color is yellow and is expected to live around ten billion years. The O- type star is the biggest of all of the stars. It won’t live very long like the M stars because it uses a lot of “fuel”. They will only live around one billion years. That is a blink of an eye compared to how long …show more content…
Scientists don’t know exactly what it is because we can’t taste, feel, see, or hear it. Although there are not many signs that tell us there is dark matter, we know something is out there.We can see its effects on planets, galaxies, and stars. Dark matter does not interact with electromagnetic forces. That means it can’t absorb, emit, or reflect light. That makes it extremely hard to find. In fact it is so hard to find that researchers can only infer the existence of dark matter. It was discovered by Fritz Zwicky at Caltech in 1933. It is very important how dark matter helps move planets, black holes, stars, nebulae, and galaxies. Dark matter takes up approximately twenty-seven percent of the
As long as humans have been alive they have questioned and tried to explain the purpose of the visible pieces of the universe. Egyptians thought that the sun god, Ra, had to deal with the universe and how it “reincarnates”. The Chinese made pictures of the stars …show more content…
We can only see 13.8 billion light years in one direction. This happens because the light from beyond that point hasn’t reached us yet. It keeps growing at the speed of light. The speed of light is approximately 186,282 miles per second. An important part of our visible universe are stars. A star is born when atoms of light elements are squeezed under enough pressure for their nuclei to undergo fusion. All stars are a result of force: the force of gravity compresses atoms in interstellar gas until the fusion reaction begins. Stars come in different sizes. The smallest star is called the M- type or the M star. They are just big enough to initiate nuclear fusion at its core. If they were smaller, they would be brown dwarfs, substellar objects but still many times bigger than the biggest planet in our Solar System, Jupiter. They can live for around one hundred billion years With increasing mass stars start to change in size, luminosity, and color. Our sun is considered a G star. It is a small medium size. It is bigger than M-stars and K-stars, but smaller than F, A, B, and O stars. Its color is yellow and is expected to live around ten billion years. The O- type star is the biggest of all of the stars. It won’t live very long like the M stars because it uses a lot of “fuel”. They will only live around one billion years. That is a blink of an eye compared to how long …show more content…
Scientists don’t know exactly what it is because we can’t taste, feel, see, or hear it. Although there are not many signs that tell us there is dark matter, we know something is out there.We can see its effects on planets, galaxies, and stars. Dark matter does not interact with electromagnetic forces. That means it can’t absorb, emit, or reflect light. That makes it extremely hard to find. In fact it is so hard to find that researchers can only infer the existence of dark matter. It was discovered by Fritz Zwicky at Caltech in 1933. It is very important how dark matter helps move planets, black holes, stars, nebulae, and galaxies. Dark matter takes up approximately twenty-seven percent of the