i got 3 *including today* to answer this, kill me
6.1 Understanding the Universe

Scientists estimate that the universe is about ______________ years old? The Earth is about _______years old? (p.445).

Since scientists cannot make direct observations of most astronomical objects, they must study _______ from these ________

___________ to gain ______________ about them.

Scientists can then use this ____________ from the _________ _________ to better understand the ___________ __ the ________________.

Advances in _______________ over the last century have allowed _______________ to make observations of ____________ and more___________objects across the entire ______________ __________.

These observations have yielded evidence about the origin of the _____________.

With this evidence, scientists developed a __________ to explain the ___________ ___________ of the _____________.

___________ ___________ are ways of ____________ why things happen in the ______________ __________.

They begin with a _________________, or an _________ of how scientists think __________ _________.

Scientists then collect________ to ______ the ___________.

__________ __________ are thought ___________ until new ____________ suggests _____________ ____________.

Scientists always check _____________ by collecting more _____________ and by _____________.

Sometimes, ____ _______________ cause a _________ to be ____________ or ______________ to match the new __________(p.447).

The theory of how the __________ came to be is explained by the ____ ________ _________; it was first proposed in ______(year).

The ____ ______ __________ is generally accepted because ?

However, details about the theory are still being?

Less than a century ago, the ___________ was thought to be _______ (unchanged) and __________(limitless).

The _____ _____ __________ held that the universe had ________existed in its ________ ________, with ________ ______ _________.

However, in the _________s, American astronomer ________ ___________ discovered that the _________ was in fact ________.

This showed the _____ ______ _______ to be ________?

The ___ ______ ______ eventually too its place as the ________ _________ ____________ to explain the origin of the __________?

The Big Bang theory states that the ___________ formed during a ________ ____ in which all _______ and _______ suddenly __________ from an extremely _______ ________.

This point, called _____________, is thought to have been ______________, _________ ______, and ________ ____.

It is thought to have been smaller than a ________ _______ and made of _______ ________.

One of the biggest mysteries of the ____________ is how the _________ __________ inflated at an extremely _____ _____ from a ________ to the size of a _________ almost ____________.

This mystery continues to ____________ (bother) __________, but the laws of ___________ do allow for such an _____.

To measure the age of the universe, scientists exploit the fact that _________ travels at ________(defineabe) ___________.

Scientists express _________ in the universe units called ______- ________.

A ______- ______ is the measure of the ________ in ________ equal to the distance that ________ travels in one ________?

One light-year equals about ________________kilometers(km).

Because objects in space are ,many ______-_______ away, the _______ and other _________________ _________that an observer on ___________ detects actually originated many ______ ____.

An observer is literally seeing _____ the _____.

This means that if scientists look back in ______ far enough, they can make observations about ________ states of the ___________.

By determining the _____ at which the __________ is __________, scientists can work _____________ to determine the age of the ____________: approximately ___________years.

During the initial expansion of the ___ ______, the laws of physics _______ into _______(.p447)

Science assumes that the universe works as a _______ _______ and the interactions of ______ and _________ are governed by the same _________ everywhere.

The theories and laws we develop from _____________ on _____ can be used to _______ the formation of the ______________.

Our understanding of __________ is a good _______ of this.

Scientists say that the exact amount of ______ necessary to produce the __________ existed in the ____________.

Too little ________, and ___________ would exist because ________ would have _______ formed.

Too much ________, and _________ but a series of ________ ________ would have ______.

Because ______ _______ gravity existed, some of the tremendous _______ of the ____ _____ converted to _______ in the form of ___________ and other _____________ ____________.

All the objects of the ___________ are made of _______ that developed during the _____ __________ of a ________ following the ____ _________.

The Law of _________________ of _______ states that __________ can neither be…[Read more]