Moon
When half of the moon is showing and half is not what is this phase called?
First-quarter, Last quarter
What galaxy is the most common in the universe?
Elliptical galaxies
The largest type of star in the universe?
Red supergiant stars
What is the moon made of?
The Moon is made of rock and metal—just like the Earth and the other rocky planets (Mercury, Venus, and Mars). The crust, the Moon's outer shell, is covered by the lunar soil.
How are galaxies named?
If they have been known for a long time they may have been named for their discoverer (ie. Magellan for the LMC) or the constellation they are in (like Sagittarius). Today, they are usually named with just a number and a catalog name.
Who has a gravitational pull so strong that even light cannot escape it?
A black hole
How far is it from Earth to the moon?
It is about 250,000 miles from Earth to the moon.
Does the Milky Way spin counter-clockwise? If so, do all spiral galaxies spin in this direction, and why?
The direction that the Milky Way spins depends on your perspective. For example, take a top and spin it clockwise on a glass table. Then look at the spinning top from below the glass table - it will appear to spin counter-clockwise now. Or similarly, draw an arrow on a piece of paper in the clockwise direction, then hold the paper up to a light, looking at it from the bottom - now the arrow goes in the counter-clockwise direction. Thus the direction of the spin of any galaxy depends on your perspective when you look at it.
Red dwarf stars
How big is the moon?
The moon is about 2,000 miles across.
How are galaxies and solar systems similar?
There are similarities between spiral galaxies and protoplanetary disks, namely their disk-like appearance. The physical process behind the disk formation is the same in both cases: both the matter that collapses to form a galaxy and that which collapses to form a star or planet
Can gravity form waves?
Yes, gravity can forms waves. Gravitational waves are ripples in spacetime that travel through the universe.
Why does the moon have big rocks?
There is no air or wind on the moon, so the rocks don't get worn down as they do on the earth.
Traveling at light speed, how long would it take to get to the nearest galaxy?
25,000 years
How do space ships make artificial gravity?
Despite the fact that outer space is brimming with gravity, the lack of solid ground in space means that objects without thrust are in a continual state of free fall, and free-fall feels just like zero gravity.