Big Bang Blast!
This is what we call the tiny, super-hot point where everything in the universe was packed at the moment of the Big Bang.
Scientists gave this name to Jupiter's early movement in the solar system.
the "Grand Tack"
This term refers to the motion of the Earth spinning on its axis.
Rotation
The "giant impact" hypothesis is a theory that tries to explain how this celestial body was formed.
the Moon
This type of telescope uses mirrors to gather and magnify light.
Reflector telescope
Most scientists agree that this important cosmic event took place about 13.7 billion years ago.
The Big Bang
This is the path an object takes around another object in space.
Orbit
This is the number of days it takes for the Earth to revolve around the Sun.
365 and 1/4 days
This occurs when the Earth passes between the sun and the moon.
A lunar eclipse
The lens at the front of a refractor telescope is called the _____________ lens.
Objective lens
Scientists "listening" to outer space picked up this hissing sound, which they determined was leftover energy from the Big Bang.
The Cosmic Microwave Background
This was the first planet to be formed in our solar system.
Jupiter
"Perihelion" is the point during its revolution when the Earth is ___________ to the sun.
"closest"
In this phase of the moon the entire lit side is visible.
Full moon
Astronomers use these celestial clusters to navigate the night sky and locate other objects in space.
Constellations
According to our lesson, scientists use this word to describe the expansion that occured immediately after the singularity.
Rapid
Our solar system formed about this many years ago.
4.6 billion years ago
This occurs every four years as a way to compensate for the extra 1/4 day of the Earth's yearly revolution around the Sun.
a "leap year"
During this type of eclipse, the moon fully blocks the sun.
Total solar eclipse
A more common name for the "Great Bear" constellation is the "_________ -___________."
The "Big Dipper."
Scientists compared cosmic microwave background to this kind of typical family keepsake.
This is the force that keeps the planets in orbit around the Sun.
Gravity
This is the term for the 2 days of the year when day and night are exactly the same lenth.
Equinox
This entire process takes about 29.5 days.
The lunar cycle
The Egyptian astronomer, Ptolemy, described 48 constellations in the 3rd century. Astronomers now believe there are as many as _______ constellations observable from Earth.
88