Evidence gathered from observations of exoplanets indicates approximately what percentage of stars have planets?
A) 0
B) 1
C) 10
D) 100
E) It is not yet possible to make an estimate.
D
You might also like to view...
If, from the point of view of Earth-bound observers, the Moon is in new Moon phase on a particular day, what phase is Earth as seen from the Moon?
What will be an ideal response?
On which temperature scale is 212 degrees the boiling point of water?
A) Celsius B) Caloric C) Kelvin D) Fahrenheit E) none of the above
A satellite in a circular orbit of radius R around planet X has an orbital period T. If Planet X had one-fourth as much mass, the orbital period of this satellite in an orbit of the same radius would be
A) T B) 2T. C) T/2. D) 4T. E) T/4.
An electron has a relativistic momentum of 1.1 × 10-21 kg-m/s. What fraction of its total energy is its kinetic energy?
What will be an ideal response?