Science Final. (Not Complete)

Cosmic Microwave Background Radiation (CMBR) is the term used to describe the residual microwave radiation observed everywhere in the universe that seems to have no single source. The observation of CMBR is used as evidence of the Big Bang Theory because it is believed to be -

radiation left over from the rapid expansion of matter.

The theory of the origin of the universe that is most popular among space scientists suggests that our universe originated how long ago?

10 - 20 billion years ago

The theory of the origin of the universe that is most popular among space scientists suggests that our universe originated how long ago?

10 - 20 billion years ago.

Which of the following best describes a nebula? A nebula is -

an interstellar cloud of dust, hydrogen, helium and other gases.

All the stars we observe from Earth emit light that is shifted, to varying degrees, to longer wavelengths. This evidence is used to support the Big Bang Theory because it shows that stars we observe -

are moving away from us.

The Big Bang Theory of the origin of the universe is supported by evidence that shows that light from every star is shifted to longer wavelengths. This evidence supports the Big Bang Theory because it shows that stars we observe -

are moving away from us.

Galaxies are classified into all of the following types by their shapes EXCEPT -

crescent

By comparing the actual brightness of a star to its apparent brightness astronomers can determine a star's -

distance from Earth.

Cosmic Microwave Background Radiation is used to support the Big Bang Theory because it suggests -

electromagnetic energy left over from an explosion can be found everywhere in the universe.

Which of the following characteristics of elements is used by astronomers to determine the chemical composition of distant stars? All elements -

emit certain wavelengths of light when heated.

A characteristic of a nebula is that it -

is a region where stars are born.

The nearest star to our solar system, Proxima Centauri, is 4.2 light years away from Earth. With this information one can reasonably conclude that -

light from Proxima Centauri takes about 4.2 years to reach Earth.

To express the distance between the Milky Way galaxy and the Andromeda galaxy, the most appropriate unit of measure is the -

light year.

Which of the following best describes a general trend in the change of the characteristics of the universe over time, which agrees with our current understanding of the formation of the universe? The universe is changing from -

more dense to less dense.

Astronomers have observed that light emitted by stars in the universe is shifted towards the longer wavelengths of the visible light spectrum. This evidence supports the Big Bang Theory because it suggests that the stars are -

moving away from Earth and each other.

All observable objects outside our galaxy, when viewed from Earth, have their spectra shifted to slightly longer wavelengths. Astronomers have concluded that this is evidence that all objects in the universe are -

moving away from each other.

Many of the stars seen in the night sky are much larger than the Sun, but appear much smaller. The Sun appears larger than larger stars because the Sun is -

much closer.

When trying to determine the approximate age of the universe, scientists have used data on the ages of stars. What conclusion can they logically draw from this data? They can conclude that the universe -

must be older than the oldest stars.

The wavelengths of light emitted by a star can provide information on all of the following characteristics of a star EXCEPT -

number of planets orbiting the star.

Galaxies are classified by their shapes into all of the following types EXCEPT -

oblong galaxy.

Astronomers make observations in visible light, but also in other parts of the electromagnetic spectrum, such as radio and gamma waves. Scientists make observations in different wavelengths because -

observations in different wavelengths provide different information about stars.

Astronomers can determine the chemical composition of stars by observing which of the following?

Wavelengths of light emitted by the star.

A system of stars, gas, dust, and dark matter bound together by gravity is called -

a galaxy.

A large celestial body made of gases that emits light due to nuclear reactions is called -

a star.

Which of the following components of the universe is best described as an interstellar cloud of dust and gases where stars can form?

A nebula

The Big Bang Theory postulates that our universe formed as the result of a huge explosion that sent all existing matter flying outward from a single point. Which of the following observations is used as evidence of this theory?

All galaxies appear to be moving away from all other galaxies.

The Big Bang Theory suggests that our universe formed as the result of a huge explosion that sent all existing matter flying outward from a single point. The Big Bang Theory is supported by which of these observations?

All galaxies appear to be moving away from all other galaxies.

The Big Bang Theory proposes that the universe began as a very small and very dense area that expanded rapidly. Which of the following observations about the universe supports the Big Bang Theory?

All galaxies appear to be moving further away from one another.

Which of the following is an accurate description of the relationship between components of the universe?

Galaxies contain many stars.

The stars and all the other matter in a galaxy are held together by which of the following?

Gravity

Which of the following observations is evidence that supports the Big Bang Theory explanation for the origin of the universe?

Background microwave radiation.

Astronomers can heat elements here on Earth and observe the wavelengths of light, which the elements emit. By then analyzing the light from distant stars, the astronomers can determine what property of these stars?

Chemical composition

Describe what a galaxy is and include at least three different shapes by which galaxies are classified.

Correct answer will include: -a system of stars, interstellar gas, and dust held together by gravity; -elliptical, lenticular, spiral, or irregular.

Stars are made mostly of which two elements?

Hydrogen and helium

The Sun appears to be bigger than all other stars because its size is much larger than any other star in the galaxy.

False. It is not bigger, the size is average, it is just much closer.

As part of the Big Bang Theory of the formation of the universe, scientists believe that over time, the universe is continually changing in what characteristic?

From more dense to less dense.

Which of the following best describes the relative size of our Sun?

Medium-sized compared to all stars.

Which of the following best describes a general change of the characteristics of the universe, which agrees with our current understanding of the formation of the universe?

Objects are moving further apart.

Which of the following best describes the position of the Sun relative to other objects in space?

On the edge of the Milky Way Galaxy.

Astronomers often use the radio waves emitted by stars much as they do visible light. What advantage is there in making observations using radio waves?

Radio waves can be collected even during daytime.

A light year is a unit appropriate for measuring which of the following characteristics of celestial bodies?

Size of galaxies.

The Sun is what type of celestial object?

Star

The absolute color of light emitted by a star is most useful for giving information on what feature of the star?

Temperature