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exploring the universe

Across
"where is everybody" is a question know as the _______
_____ paradox helps explain why the sky is dark at night
Pulsars are a source of _____ waves
Stars with a smaller number apparent magnitude appear to look _____
Comparing stars apparent and absolute magnitudes help us measure a stars _____ to earth
The colors the human eye can see is the ____
What type of spectrum has all colors present?
Hotter objects emit ___ light at all wavelengths
Objects moving towards us appear _____
There is no edge to the universe. true or false?
____ main sequence stars are hotter and brighter
Missing matter=____matter
Closer planets take ____ time to discover
The sun is about the same density as water...true or false?
The idea that there is no prefered location or best location in the universe is know as the _____ principal
Is there evidence for water on mars?
The _____ equation can be used to calculate the number of civilizations in our galaxy that we could receive a signal from
A greater redshift tells us how much the universe has ____
Down
The Big Bang has been able to be recreated in a lab. true or false?
The universe has gotten _____ over time
13.8 billion years is the age of the ____
The farther away a galaxy is, the ____ it is moving away from us (Hubbles law)
Gravity is stronger if objects are ____
The distance between adjacent peaks
Thermal radiation is also called _____ radiation
One example of something that would have an _____ spectrum is a florescent light
In an atom, for an electron to move to a lower level, energy must be _____
You can use binary stars to calculate what?
The speed of light is a____speed
Objects moving away from us have a _____ wavelength
The study of the universe as a whole
Is space expanding or shrinking?
One argument to explain the fermi paradox is there has not been enough ___ for other civilizations to get to us