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

Author Question: For a galaxy 200 Mpc away, a useful standard candle would be the ________. Fill in the blank(s) ... (Read 76 times)

kshipps

  • Hero Member
  • *****
  • Posts: 571
on: Jul 27, 2018
For a galaxy 200 Mpc away, a useful standard candle would be the ________.
 
  Fill in the blank(s) with correct word

Question 2

Describe how Eratosthenes first measured the size of Earth over 2000 years ago.
 
  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

cclemon1

  • Sr. Member
  • ****
  • Posts: 312
Reply #1 on: Jul 27, 2018
Answer to Question 1

Type I supernova

Answer to Question 2

Eratosthenes used measurements of the angle of the Sun in the sky at noon on the summer solstice in two places in Egypt. It was directly overhead in Syene and cast no shadows. In Alexandria, however, there was a slight shadow, indicating that the Sun was 7 degrees away from overhead. Eratosthenes concluded that Alexandria lies at a latitude 7 degrees north of Syene. The circumference of Earth is then the distance between Syene and Alexandria divided by the fraction of the circle (7/


kshipps

  • Member
  • Posts: 571
Reply 2 on: Jul 27, 2018
Wow, this really help

duy1981999

  • Member
  • Posts: 341
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

Did you know?

About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

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?

People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

Did you know?

According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.

Illustration of the Milky Way galaxy, showing the location of the Sun Illustration of the Milky Way galaxy, showing the location of the Sun
Standard Model of Elementary Particles Standard Model of Elementary Particles
Peculiar Galaxy NGC 5128 (Centaurus A) Peculiar Galaxy NGC 5128 (Centaurus A)
Fill finish processes - Inoculum Preparation & Expansion Fill finish processes - Inoculum Preparation & Expansion
Standard reduction potentials of the major respiratory electron carriers Standard reduction potentials of the major respiratory electron carriers
Standard base-pairing relationships Standard base-pairing relationships
Video: Parathyroid hormone (bone resorption) & Calcitonin (bone deposition)

For a complete list of videos, visit our video library