Sun
What will happen to the relative amounts of hydrogen and helium in the sun over the next few billion years?
Hydrogen will decrease, and helium will increase.
The parallax of a star is observed because ______.
the observer moves.
The large, irregular objects mostly located between Mars and Jupiter are called _____________.
asteroids
Because there is no __________________ on the moon, any liquid water would have evaporated into space long ago.
atmosphere
Name two gas giants.
What is Jupiter, Saturn, Uranus, or Neptune?
For the sun to be stable, the inward and outward forces within the sun must be __________.
What is in equilibrium.
In an H-R diagram, most stars are found in a diagonal band from the upper left to the lower right, which is called the _______________.
main sequence
**Stars stay in this main sequence about 90 percent of their lifetimes.**
The material that formed the solar system originated from a solar _______________.
nebula
What formed the moon’s maria?
What is ancient lunar lava flows
What keeps a planet in its orbit?
What is gravitational pull of the sun.
Icy objects that mostly travel in long, elliptical orbits around the sun are _________.
What is comets.
A hot, bright star would appear in which section of an H-R diagram?
upper left
The length of a planet’s day is determined by its _______________.
period of rotation
What causes a lunar eclipse?
Moon moves into the Earth's shadow (Sun, Earth, and Moon are exactly or very closely aligned with Earth between the other two).
Which evidence provides support for the nebular theory?
What is observations of protoplanetary disks around distant newborn stars.
The ____________________ belt contains perhaps tens of thousands of objects orbiting within about 100 AU of the sun.
Kuiper
What is a pulsar?
What is a spinning neutron star emitting radio waves
A diagram that shows the Earth at the center of the solar system is known as a ___________.
What is a geocentric model.
What is the difference between a full moon and a new moon?
Full moon-->entire sunlit side faces Earth (Earth is between the sun and the moon)
New moon--> moon’s dark side faces Earth (moon is between the sun and Earth)
What are some technologies used in space exploration.
What are space shuttle, the International Space Station, Hubble telescope, space probes, etc.
Nuclear fusion within the sun takes place within the ________.
What is core.
What two factors cause a nebula to develop into a star?
gravity and heat from contraction
All of the planets in the solar system have _____________ with the exception of Mercury and Venus.
moons
What is the current hypothesis on how Earth’s moon formed?
What is a collision between Earth and another planet the size of Mars.
When is all school work due?
What is last day of school--May 20th!!