Planets
This is why we haven't sent astronauts to Jupiter.
It is too far to get people there AND back safely. Not enough gas on ship
What measurement do we use when comparing objects IN our solar system?
Astronomical units (AU)
List star colors from coolest to hottest.
red, orange, yellow, white, blue
Every galaxy contains _________ of stars
billions
What happens to gases in the convective zone after the rise, then cool?
The gases sink back down to be re-warmed by the core
This planet has the longest orbital path.
Neptune
This model placed Earth at the center of the universe.
Geocentric.
these characteristics are used to classify stars
color, size, temperature, brightness
There are _________ galaxies in the universe.
billions of
When distance increases, gravity ________.
decreases.
Name the planets in order from shortest period of revolution to longest.
Mercury, venus, earth, mars, jupiter, saturn, uranus, neptune.
These planets have at least 2x the gravitational pull of earth.
Jupiter, saturn, uranus, neptune
Dense, extremely hot, nuclear fusion
Our galaxy is called the _______ ______ & it is __________ shaped.
milky way; spiral
Which planet is the hottest & why?
Venus- greenhouse effect
This is why earth rarely gets hit by meteors/asteroids.
Our atmosphere burns most of them upon entry
This is why gas giants have the most moons.
They are the largest(Highest mass), so they have more gravity, grab more objects
These stars appear brightest from Earth
the closest to Earth
What is our cosmic address?
Earth, solar system, milky way galaxy, universe.
What measurement would we use to calculate the distance between 2 stars like Rigel & Betelgeuse?
light years
These planets experience less gravitational pull from the sun.
outer planets/further planets
Describe the sun's rotation.
Differential- the equator spins faster than the rest
Compare the inner & outer planets. 3 each:
inner- smaller, few moons, warmer, rocky/terrestrial, thin atmospheres.
outer- gas/ice giants, many moons, dense atmospheres, colder
A planet's period of rotation is equal to its _________.
Day/night