« previous next »

Author Question: Cometary impacts with Jupiter A) are impossible to observe from Earth. B) are spectacular but do ... (Read 84 times)

Sufayan.ah

  • Hero Member
  • *****
  • Posts: 512
on: Jul 27, 2018
Cometary impacts with Jupiter
 
  A) are impossible to observe from Earth.
  B) are spectacular but do not teach us much.
  C) have been observed from Earth at least twice.
  D) are extremely rare.
  E) would not be catastrophic if they happened on Earth.

Question 2

What is the primary visible color of an emission nebula?
 
  A) blue due to ionized helium atoms
  B) red due to the H line of hydrogen
  C) black, because of dust
  D) blue from the scattering of light off the tiny molecules
  E) red because of reddening by dust


vkodali

  • Sr. Member
  • ****
  • Posts: 357
Reply #1 on: Jul 27, 2018
Answer to Question 1

C

Answer to Question 2

B


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

Did you know?

Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

Did you know?

Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.

Did you know?

More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

From space earth shows itself as a planet covered mostly by water. From space earth shows itself as a planet covered mostly by water.
Humanmade pollutants may be driving the expansion of the Earth’s tropical belt seen Humanmade pollutants may be driving the expansion of the Earth’s tropical belt seen
The span of Homo sapiens sapiens’ time on earth The span of Homo sapiens sapiens’ time on earth
The Distribution of Water on Earth The Distribution of Water on Earth
A spaceship leaves Earth at a steady forward speed of 70% the speed of light. How fast relative ... A spaceship leaves Earth at a steady forward speed of 70% the speed of light. How fast relative ...
Earth 150 Million Years Ago Earth 150 Million Years Ago
Video: Photosynthesis overview Animation

For a complete list of videos, visit our video library