This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: What is Tunguska? A) the site of an asteroid impact that occurred in Siberia in 1908 B) a ... (Read 70 times)

Yi-Chen

  • Hero Member
  • *****
  • Posts: 550
on: Jul 27, 2018
What is Tunguska?
 
  A) the site of an asteroid impact that occurred in Siberia in 1908
  B) a postulated binary companion to the Sun thought to be responsible for mass extinctions
  C) a long period comet that struck Jupiter in 1994
  D) the Gulf of Mexico basin that is the crater of the asteroid impact that caused the mass extinction of the dinosaurs 65 million years ago
  E) a newly discovered moon of Pluto

Question 2

Suppose you discovered a star made purely of hydrogen and helium. How old do you think it would be? Explain.
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

ngr69

  • Sr. Member
  • ****
  • Posts: 318
Reply #1 on: Jul 27, 2018
Answer to Question 1

A

Answer to Question 2

A star made of only hydrogen and helium would have to be among the first generation of stars ever born, arising out of the primordial mix of elements that came from the Big Bang. The oldest stars we know about are over 12-15 billion years old and star made of only helium and hydrogen would have to be at least this old. Note that no such star has ever been discovered.


Yi-Chen

  • Member
  • Posts: 550
Reply 2 on: Jul 27, 2018
Excellent

Viet Thy

  • Member
  • Posts: 329
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

Did you know?

More than 4.4billion prescriptions were dispensed within the United States in 2016.

Did you know?

Individuals are never “cured” of addictions. Instead, they learn how to manage their disease to lead healthy, balanced lives.

Did you know?

Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

Did you know?

A serious new warning has been established for pregnant women against taking ACE inhibitors during pregnancy. In the study, the risk of major birth defects in children whose mothers took ACE inhibitors during the first trimester was nearly three times higher than in children whose mothers didn't take ACE inhibitors. Physicians can prescribe alternative medications for pregnant women who have symptoms of high blood pressure.

Tiny 'Spherules' Reveal Details About Earth's Asteroid Impacts Tiny 'Spherules' Reveal Details About Earth's Asteroid Impacts
Viking Lander 2 site May 1979 Viking Lander 2 site May 1979
Asteroid Asteroid
Asteroid Orbits Asteroid Orbits
An Oil Exploration Drill Site An Oil Exploration Drill Site
Video: Stomach peristalsis & Enterogastric reflex

For a complete list of videos, visit our video library