Which of the following statements about an ellipse is NOT true?
What atmospheric constituent is responsible for the blue color of...
A net force acting on an object will always cause a change in the...
How does a 12-month lunar calendar differ from our 12-month solar...
The astronauts feel weightless in the International Space Station,...
Olympus Mons is
An angle of 1 arc second is
Why does Earth have the strongest magnetic field among the...
According to modern science, what was the approximate chemical...
Newton showed that Kepler's laws are
Where is most of the water on Mars?
What is the acceleration of gravity on Earth?
Suppose you drop a 10-pound weight and a 5-pound weight on the Moon,...
We are not yet capable of detecting life on planets around other...
Which in its gaseous form is not a greenhouse gas?
You are standing on Earth's equator. Which way is Polaris, the...
Which moon is considered likely to have a deep, subsurface ocean of...
Which of the following statements best explains why the planets orbit...
The Huygens probe took numerous pictures as it descended to...
According to the universal law of gravitation, if you double the...
The Chandra X-ray Observatory must operate in space because
If the Earth's rotation axis was tilted by 45 degrees instead of...
Which moons are sometimes called the Galilean moons?
What happens during the apparent retrograde motion of a planet?
The point along a planet's orbit where it is closest to the Sun is...
Considering Einstein's famous equation, E=mc^2, which of the...
How do scientists estimate how old the solar system is?
As an interstellar cloud of hydrogen gas shrinks in size, its rate of...
Compare the energy and speed of infrared and visible light. Which of...
The angular separation of two stars is 0.1 arc seconds and you...
In general, how does the size and location of a star's habitable...
Hot Jupiters were a surprise to astronomers. What is the current...
For most of history, the lack of observable stellar parallax was...
Kepler's third law, = means that
What is the purpose of adaptive optics?
The Antarctic ice-core plot of carbon dioxide (ppm) shows peaks and...
Why do the patterns of stars in our sky look the same from year to...
What kind of thermal radiation does the Earth emit?
If the freezing point of ices of all types was at a much lower...
If we use 1 millimeter to represent 1 light-year, how large in...
Galileo observed all of the following. Which observation offered...
The mass of Jupiter can be calculated by
Which of the following discoveries would cause us to re-evaluate the...
Which of the following gases, which we can detect (if present) in...
How do we know the mass of Neptune?
Which of the following methods uses the principle of orbital...
According to the universal law of gravitation, the force due to...
A rock held above the ground has potential energy. As the rock falls,...
How does the Kepler mission plan to detect Earth-like planets around...