How do we know where comets come from?
How do we know where comets come from?
- The comets from the Oort cloud don’t produce a tail, but those from the Kuiper belt do
- Those that come from the Kuiper belt are composed of slightly different materials than those from the Oort cloud
- Astronomers only guess where these comets come from, they don’t know for sure
- The comets from the Oort cloud travel at much greater velocities than those from the Kuiper belt
- The comets from either location have a trajectory or pathway that can be traced back to their starting point once we see them
The comets from either location have a trajectory or pathway that can be traced back to their starting point once we see them
You might also like to view...
A non-conducting sphere of radius R = 7.0 cm carries a charge Q = 4.0 mC distributed uniformly throughout its volume. At what distance, measured from the center of the sphere, does the electric field reach a value equal to half its maximum value?
A) 3.5 cm only B) 4.9 cm only C) 3.5 cm and 9.9 cm D) 3.5 cm and 4.9 cm E) 9.9 cm only
An electron is fired through a pair of deflection plates, which produce a 2.00 cm long region with an electric field of 4000 N/C perpendicular to the electron's initial velocity. If the initial speed of the electron is 
what is its new component of velocity after going through the deflection plates?
a. 
b. 
c. 
d. 
e. 
Escape Speed: The value of g at the surface of the spherical Asteroid X is 0.0060 m/s2 and the escape velocity is 10.1 m/s. What is the mass of this asteroid? (G = 6.67 × 10-11 N ? m2/kg2)
A. 2.3 × 1016 kg B. 3.5 × 1012 kg C. 6.5 × 1015 kg D. 4.9 × 1014 kg E. 6.7 × 1013 kg
Which of the following is not a major reason why astronomers would like an observatory on the far side of the Moon?
A) Telescopes on the Moon could see objects in all parts of the sky equally well, whereas telescopes on Earth can see only portions of the sky that depend on their latitude. B) Radio astronomy would be advantageous on the Moon because human radio transmissions are less likely to cause interference, especially on the far side of the Moon. C) It would be possible to put telescopes for ultraviolet and X-ray astronomy on the surface, unlike the case on the surface of the Earth. D) Telescopes on the Moon could observe stars even when it is daytime on the Moon.