big bang
what is the big bang
rapid expantion of the universe from a single point
what are the inner four planets
mercury, venus, earth and mars
what is solar system formation
the role of gravity
what is a meteoriod
a small piece of matter before they enter atmosphere
how many evidences are there for the big bang
3
what are the outer four planets
jupiter, saturn, uranus and neptune
wht are planets orbits held by
gravity
what is a meteor
a small piece of matter enters the atmosphere
what is hubble's law
hubble found a way to calculate the expansion of the universe
how many moons does mars have
2
what does the force of gravity depend on between two objects
mass and distance
what is a meteorite
a small piece of matter that survives the atmosphere and lands on earth
what is redshift
light shifts red as the light source moves away from the observer
what are the planets in order
mercury venus earth mars jupiter saturn uranus neptune
what planets orbit in the same direction as earth
all of them
larger objects are typically ?
asteriods and comets
what percent of the universe is hydrogen
75%
how many planets does saturn have
62