Question

I will give a medal and will fan them if someone can help me with Astronomy.

Answer 1

1. How did astronomers confirm the existence of dark ENERGY?
a. by calculating it using Kepler’s third law
b. by measuring the mass of galaxies
c. by detecting it with telescopes
d. by the ages of globular clusters

2. How did astronomers confirm the existence of dark MATTER?
a. by measuring how fast the universe is expanding
b. by detecting very hot gas in galaxy clusters that emits X-rays
c. by measuring the amount of compressed gas in the universe
d. by detecting electromagnetic radiation reflecting from the dark matter

Answer 2

@lulubj I need your help with more than these two questions.

Answer 3

i think first one is d and second one is b

Answer 4

Thank you so much, could you help with a few more?

Answer 5

yes why not @Anestasia

Answer 6

3. Which of the following uses the bending of light from a background object by the gravity of a foreground object to detect dark matter?
a. the Doppler effect
b. gravitational lensing
c. cosmic radiation background
d. the Hubble telescope

4. How do astronomers measure the amount of dark matter in the universe?
a. by analyzing the luminosity of nearby star clusters
b. by measuring the electromagnetic radiation emitted from the dark matter
c. by detecting the Doppler shirt if the dark matter as it moves between galaxies
d. by comparing the gravitational mass of galaxies to the luminous mass of galaxies

Sorry, I have a lot of question. I tried answering as many as I could, but these ones, + the ones I haven't posted yet were super hard. :/

Answer 7

according to me c for first and d or a for second
sorry second one is not confirmed most probably a

Answer 8

Sorry about the wait, I had to watch a kid. Here are the next two?

5. Astronomers believe that the universe has more mass than what is visible in stars, dust, and gas. What is this unseen mass called?
a. dark cluster
b. dark energy
c. dark nebula
d. dark matter

6. Dark matter makes up_____ percent of the known universe.
a. 4
b. 23
c. 73
d. 99

Answer 9

d and c

Answer 10

7. The acceleration of the universe’s expansion by many cosmologists to the presence of which of the following?
a. dark matter
b. black holes
c. dark energy
d. gravitational pull of unseen galaxies

8. It is possible that the universe may
a. explode within the next million years
b. further break itself apart, creating new structures in space
c. continue to expand forever
d. dissipate from lack of sufficient matter

I have two more after this and then I'm done. Thank you so much for helping me out so far. :)

Answer 11

c and c or d

Answer 12

And the last two?

9. What do some scientists hypothesize will happen if the universe continues to expand?
a. Stars will fade and die out, creating an environment too cold to live in
b. the universe will reach its maximum limit and galaxies on the edge will die
c. some galaxies will stretch themselves to such a large size that they will eventually all become one
d. the galaxies will grow individually and never be visible from our planet again

10. How much of the universe do scientists speculate is composed of dark energy?
a. 75%
b. 23%
c. 13%
d. 4

Answer 13

b and for second its about 26.8% dark matter so nearly option is b

Answer 14

Thank you so much, you have no idea how happy I am for your help @Malik_asif !

Answer 15

Most welcome @Anestasia ,it's honor for me that i become a helping source for some one, sorry in last question i did not read it completely it is option a