The Essential Cosmic Perspective Chapter 3 Quizlet Review Questions
Chapter 1
In this first chapter, we developed a broad overview of our place in the universe. Asouthward we consider
the universe in more depth in the rest of the book, remember the post-obit "big picture" ideas:
Earth is not the center of the universe but instead is a planet orbiting a rather ordinary star
in the Milky Westwarday Galaxy. one of billions of galaxies in our appreciable universe.
Catholic distances are literally astronomical, simply we can put them in perspective with the
assist of scale models and other scaling techniques. When you recollect about these enormous scales,
don't forget that every star is a lord's day and every planet is a unique world.
Weast are "star stuff." The atoms from which we are fabricated began as hydrogen and helium in
the Big Bang and were later fused into heavier elements by massive stars. Stellar deaths released
these atoms into space, where our milky way recycled them into new stars and planets. Our solar
system formed from such recycled matter some 412 billion years ago.
Weast are latecomers on the catholic time scale. The universe was already more than one-half itsouth
current historic period when our solar organisation formed, and it took billions of years more before humans arrived
on the scene.
All of us are being carried through the cosmos on spaceship Earth. Although we cannot
feel this motion in our everyday lives, the associated speeds are surprisingly high. Learning about
the motions of spaceship Earth gives u.s. a new perspective on the cosmos and helps us understand
its nature and history.
Summary of Key Concepts
1.1 The Scale of the Universe
What is our place in the universe? Earth is a planet orbiting the Lord's day. Our Sun is one of
more than 100 billion stars in the Milky Westay Galaxy. Our galaxy is ane of more than than 70 galaxies
in the Local Group. The Local Group is one small part of the Local Supercluster, which is i
small part of the universe.
How big is the universe? If we imagine our Sun as a large grapefruit, Earth is a ball
point that orbits fifteen meters away; the nearest stars are thousands of kilometers abroad on the aforementioned
scale. Our galaxy contains more 100 billion stars—so many that it would take thousands of
years merely to count them out loud. The observable universe contains roughly 100 billion galaxies,
and the total number of stars is comparable to the number of grains of dry out sand on all the beaches
on World.
1.2 The History of the Universe
How did we come to be? The universe began in the Big Bang and has been expanding
ever since, except in localized regions where gravity has caused matter to plummet into galaxies and
stars. The Large Bang essentially produced merely two chemic elements: hydrogen and helium. The
rest accept been produced by stars and recycled within galaxies from ane generation of stars to the
side by side, which is why we are "star stuff."
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