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

Author Question: Suppose it turns out that one in 1 million stars has a planet that at some point in its history is ... (Read 40 times)

Tirant22

  • Hero Member
  • *****
  • Posts: 532
on: Jul 27, 2018
Suppose it turns out that one in 1 million stars has a planet that at some point in its history is home to an advanced civilization. Then the total number of civilizations that have arisen in our galaxy would be closest to ________.
 
  A) 40,000 B) 400,000 C) 40 D) 4,000 E) 400

Question 2

Is Hubble's tuning fork diagram a real evolutionary tool? Why?
 
  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

dajones82

  • Sr. Member
  • ****
  • Posts: 359
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

No, galaxies are not progressing from round ellipticals to flatter spirals over time. Observational evidence seems to indicate that collisions and tidal interactions between galaxies are commonplace and may be the main physical process driving galaxy evolution.


Tirant22

  • Member
  • Posts: 532
Reply 2 on: Jul 27, 2018
Gracias!

skipfourms123

  • Member
  • Posts: 343
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

The top 10 most important tips that will help you grow old gracefully include (1) quit smoking, (2) keep your weight down, (3) take supplements, (4) skip a meal each day or fast 1 day per week, (5) get a pet, (6) get medical help for chronic pain, (7) walk regularly, (8) reduce arguments, (9) put live plants in your living space, and (10) do some weight training.

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Did you know?

Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.

Did you know?

In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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.

Dentition, as illustrated in Knight's Sketches in Natural History Dentition, as illustrated in Knight's Sketches in Natural History
Nursing history for musculoskeletal assessment Nursing history for musculoskeletal assessment
The Martial History of U.S. Brides and Grooms The Martial History of U.S. Brides and Grooms
Stressing that education reproduces a country’s social class system, conflict theorists point out ... Stressing that education reproduces a country’s social class system, conflict theorists point out ...
Ischemic compression (i.e., direct pressure) to a trigger point in the trapezius muscle. Ischemic compression (i.e., direct pressure) to a trigger point in the trapezius muscle.
Point of Intersection of 2 Circles Point of Intersection of 2 Circles
Video: Control of ventilation rate by other brain centers (posts, hypothalamus & cerebral cortex)

For a complete list of videos, visit our video library