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Cosmos DVD episode 5: A Sky Full of Ghosts
Terms in this set (37)
Because even light travels at a finite speed, every star you can see in the sky is in a different place and _________.
Light takes a little over eight minutes to travel here from
was 4 years ago
If we look at a star 4 light years away, we see it as it
Due to atmospheric __________ (the bending of light by the atmosphere), the sun is visible while actually below the horizon both at sunrise and sunset.
Earth's rotation on its axis
The motion of the Sun and Moon across the sky is an illusion caused by
A light-year is a measure of
One _________ is about 6 trillion miles (6,000,000,000,000).
The greater the distance is between you and an object you are observing, the farther back in _________ you are looking.
Galileo attempted to measure the speed of _________, but failed because it moves so fast.
When a star explodes in a supernova, it forms a (an) __________, a large cloud of interstellar dust and gas.
A __________ is a large cloud of interstellar dust and gas, frequently formed by an exploding star.
A __________ is a rapidly spinning neutron star that emits beams of radiation that sweep through Earth's line of sight.
Milky Way Galaxy
The center of the __________ is about 27,000 light-years from Earth.
Scientists estimate the age of the __________ to be at least 13 billion years old.
Big Bang Theory
One theory about the universe's creation, __________, posits that everything (matter, time, space) comes from an explosion a little over 13 billion years ago.
two or more stars
Many (perhaps most) stars we see are actually __________ revolving around the center of mass of that solar system.
A star system with two stars revolving around the system's common center of mass is known as a (an)
The closest star system to our solar system, Alpha Centauri, actually consists of
What moves at about 186,000 miles per second (300,000 km/s) in a vacuum?
Visible light is just a tiny fraction of the
__________ is always pulling you down.
There are __________ places in the universe where there is zero gravity.
hydrogen and helium
What two elements make up the vast majority of all stars?
The Universal Law of Gravitation was formulated by
Michael Faraday discovered the existence of
After discovering the relationship between electricity and magnetism, Michael Faraday created the first
James Clerk Maxwell discovered that __________ moves through space as a wave at the speed of light.
James Clerk Maxwell discovered that visible light was only part of the electromagnetic spectrum and predicted the existence of
Everything in the universe is always
Albert Einstein discovered that nothing travels faster than __________ in a vacuum.
the passage of time
Albert Einstein discovered that, while the speed of light in a vacuum is a constant, ________ is a variable depending on location and velocity.
A ________ can form from the core of massive enough star that explodes (supernova) and then collapses in on itself.
The gravitation field created by a __________ is so strong, not even light can escape it.
The spherical boundary around a black hole where gravity is strong enough to stop light from escaping is known as the
The disk of extremely heated matter revolving around and spiraling into many black holes is called a (an)
Albert Einstein discovered that the speed of light in a vacuum is a __________.
is slower near strong gravitational fields
Albert Einstein discovered that the passage of time
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