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Aleks [24]
3 years ago
9

How is light used to study space?

Biology
2 answers:
bogdanovich [222]3 years ago
8 0
<span>We use the speed of light to calculate how far apart the stars are, and to estimate the size and age of the universe. Speed-of-light calculations are what confirmed that the universe is expanding. And because light takes a certain amount of time to get here, when we look at the stars, we're literally looking back in time, to what the universe was like millions of years ago</span>
devlian [24]3 years ago
7 0
We use the speed of light to calculate how far apart the stars are, and to estimate the size and age of the universe. Speed-of-light calculations are what confirmed that the universe is expanding. And because light takes a certain amount of time to get here, when we look at the stars, we're literally looking back in time, to what the universe was like millions of years ago: 

<span>"The speed of light is particularly important in astronomy. Due to the vast distances involved it can take a very long time for light to travel from its source to Earth. For example, it takes 13 billion years for light to travel to Earth from the faraway galaxies viewed in the Hubble Ultra Deep Field images. Those photographs, taken today, capture images of the galaxies as they appeared 13 billion years ago (near the beginning of the universe)." </span>

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natulia [17]

Answer:

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4 0
3 years ago
Why are frogs said to have 2 lives
Shkiper50 [21]
Frogs are said to have two lives because they live on land and in water. When they are born, and then as they grow up to live on land. 
4 0
2 years ago
An apartment complex has a floor plan with the dimensions shown. To effectively air condition a room, 20BTU's (British Thermal U
marysya [2.9K]

The dimensions of the room is not given. Lets assume a value and calculate BTU accordingly.

Answer and Explanation:

BTU, or British Thermal Unit, is defined as the amount of heat required to raise the temperature of 1 pound of water by 1° F.

In other words,BTU's measures the amount of heat an AC (or any other cooling unit) can remove from a room per hour. Higher the BTU, the more powerful the cooling.

Calculation:

Lets assume that a room is 10 feet wide and 14 feet long.

  • Step 1

Calculate the size of the room by multiplying the height of the room with its width:

size of the room= 10 × 14

                          = 140 square feet

  • Step 2

Then multiply the size of the room that you obtained in step 1 with 20 BTU per square foot, in order to get the minimum BTU's required for AC to cool a room,

140 × 20= 2800

 2800 BTU cooling capacity is required.

6 0
2 years ago
Read 2 more answers
What are three biotic factors that can affect an organism after death?
sesenic [268]
It decomposes it and returns the nutrients to the ground.
4 0
3 years ago
PLEASE HELP I WILL MARK BRAINALISTTTT
Ira Lisetskai [31]

Answer:

22. is a

23. is b

Explanation:

carbohydrates are made up of carbon, hydrogen, and oxygen

hope this helps :) have a nice day !!

**please let me know if this was wrong**

5 0
2 years ago
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