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 37 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
YES! Correct, THANKS for helping me on my review

fatboyy09

  • Member
  • Posts: 358
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

The Food and Drug Administration has approved Risperdal, an adult antipsychotic drug, for the symptomatic treatment of irritability in children and adolescents with autism. The approval is the first for the use of a drug to treat behaviors associated with autism in children. These behaviors are included under the general heading of irritability and include aggression, deliberate self-injury, and temper tantrums.

Did you know?

Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

Did you know?

To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.

Did you know?

Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

Viking Lander 2 site May 1979 Viking Lander 2 site May 1979
Asteroid 1994 XM1 Asteroid 1994 XM1
) Intradermal drug administration: (d) the needle is removed and the puncture site is covered with ) Intradermal drug administration: (d) the needle is removed and the puncture site is covered with
Polio eradication campaign in Georgia in the 1950s. In the 1950s, 20,000 cases of polio occurred ... Polio eradication campaign in Georgia in the 1950s. In the 1950s, 20,000 cases of polio occurred ...
The impact of climate change on natural ecosystems The impact of climate change on natural ecosystems
Active Site of an Enzyme Active Site of an Enzyme
Video: Sister chromatids of a metaphase chromosome animation

For a complete list of videos, visit our video library