What do we mean when we say universe quizlet?
A universe is the sum total of all matter and energy. Define astronomical unit and light year.
What best describes what we mean by the universe?
Which of the following best describes what we mean by the universe? the sum total of all matter and energy.
Where are we in the universe quizlet?
Where are we in the Universe? We are in the Milky Way Galaxy 28,000 light years away from the center in a cluster of galaxies called the Local Group, which is a part of the Local Supercluster, which is part of the Universe.
Which of the following best describes why we have seasons on Earth?
Which of the following best describes why we have seasons on Earth? The tilt of Earth's axis causes different portions of the Earth to receive more or less direct sunlight at different times of year.
What do it mean that the universe is expanding quizlet?
the expansion of the universe means. the distances between things on a large scale are increasing, so galaxy clusters are getting farther apart.
When we say the universe is expanding we mean that everything in the universe is growing in size?
Answer. When scientists talk about the expanding universe, they mean that it has been growing ever since its beginning with the Big Bang. The galaxies outside of our own are moving away from us, and the ones that are farthest away are moving the fastest.
Which of the following statements best describes what astronomers mean when they say that the universe is expanding?
Which of the following statements best describes what astronomers mean when they say that the universe is expanding? The average distance between galaxies is increasing with time.
How was the universe created?
Our universe began with an explosion of space itself – the Big Bang. Starting from extremely high density and temperature, space expanded, the universe cooled, and the simplest elements formed. Gravity gradually drew matter together to form the first stars and the first galaxies.
How would you describe the universe to someone not in our class?
How do you describe the universe to someone not in our class? The universe is everything, it includes all matter and energy.
What is our place in the universe?
We are peripherally located in one of those galaxies, known as the Milky Way. Cosmic evolution is depicted in this image from the exobiology program at NASA Ames Research Center, 1986.
Which of the following best describes the tilt of the Earth when it is summer in the northern hemisphere?
23.5 degrees relative Correct answer: The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-circular path around the sun). The day that the Earth's North Pole is tilted closest to the sun is called the summer solstice.
Which of the following correctly describes the relationship between the sky in your location on Earth?
Together, latitude and longitude pinpoint a location on Earth's surface. If you are located in the Northern Hemisphere, which of the following correctly describes a relationship between the sky and your location? The altitude of the north celestial pole equals your latitude.
Which of the following statements best describes the expansion of the universe?
Q. Which of the following best describes the expansion of the universe? As space expands, matter spreads out to fill up the empty space.
What is the expanding universe theory?
Scientific definitions for expanding universe theory According to the theory, galaxies are not moving through space but rather with space as it expands. The expansion of the universe implies that all of the matter of the universe was once concentrated in one place, which lends support to the big bang theory.
Which of the following indicates that the universe is expanding?
Which of the following indicates that the universe is expanding? The spectra of Cepheid variables, which are found in all galaxies, are red shifted.
What is the evidence that the universe is expanding?
Evidence that the universe is expanding can be found using the Doppler effect, because distant galaxies have a red shift. Objects that move away emit waves of longer wavelengths, so the light is redder. This means that the galaxies are moving away from each other, which means that the universe is expanding.
What is our universe called?
Over the next decades, the current terminology came in to use, with Milky Way as the name of our galaxy, the term Galaxy for all galaxies (groupings of billions of stars gravitationally bound), and Universe for everything.
What do we know about the universe?
These were two spectacular discoveries: 1) what followed is that we now know that there are about one hundred billion such galaxies in our observable universe in addition to our own, and that within galaxies like our Milky Way, there are about one hundred billion stars; and 2) that the universe is expanding and that …
Do you mean by universe?
The universe is the whole of space, and all the stars, planets, and other forms of energy in it.
How big is the Universe?
92 billion light-years The observable Universe is 92 billion light-years in diameter. These pictures put just how large that is in perspective.
Do we know our position in the Universe?
Our 'position' within the Universe is an entirely relative concept. We can easily define our position relative to the Sun and planets, and with respect to the nearest stars. We can also establish our approximate location within the spiral arms of the Milky Way, even though we are nestling within it.
Which of the following best describes the tilting or slanting position of the Earth in the Northern Hemisphere when it is summer in the Southern Hemisphere?
During the northern hemisphere summer solstice, Earth is tilted such that the Sun's rays strike perpendicular to the surface at the Tropic of Cancer (23.5 degrees north latitude, corresponding to the tilt of Earth's axis).
Which of the following best describe the tilting or slanting position of the Earth in the Northern Hemisphere?
Correct answer: The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-circular path around the sun). The day that the Earth's North Pole is tilted closest to the sun is called the summer solstice.
Which of the following has your cosmic address in the correct order you Earth solar system Milky Way galaxy group or cluster supercluster universe?
The answer is a) you, Earth, solar system, Milky Way galaxy, local group, local supercluster, universe.
Which of the following has your cosmic address in the correct order quizlet?
Which of the following has your "cosmic address" in the correct order? (What is your "cosmic address?" You, Earth, solar system, Milky Way Galaxy, Local Group, Local Supercluster, universe.
What theory describes the formation of the universe?
The Big Bang was the moment 13.8 billion years ago when the universe began as a tiny, dense, fireball that exploded. Most astronomers use the Big Bang theory to explain how the universe began.
What do astronomers mean when they say the universe is expanding?
The expansion of the universe is the increase in distance between any two given gravitationally unbound parts of the observable universe with time. It is an intrinsic expansion whereby the scale of space itself changes. The universe does not expand "into" anything and does not require space to exist "outside" it.
What is this universe?
The universe is everything. It includes all of space, and all the matter and energy that space contains. It even includes time itself and, of course, it includes you. Earth and the Moon are part of the universe, as are the other planets and their many dozens of moons.
Why do scientists believe that the universe is expanding?
Scientists believe the universe is still expanding outward. They believe this outward expansion is the result of a violent, powerful explosion that occurred about 13.7 billion years ago. This explosion is known as the Big Bang.
How do scientists know that the universe is expanding quizlet?
Step 1. Evidence that the universe is expanding can be found using the Doppler effect, because distant galaxies have a red shift. Objects that move away emit waves of longer wavelengths, so the light is redder. This means that the galaxies are moving away from each other, which means that the universe is expanding.