The solar system shows the planets in their orbits around the sun in this order: Mercury, Venus, Earth with Moon, Mars, Jupiter, Saturn. Fixed stars are around the outside of the orbit of Saturn.

Explanation:

Aristarchus of Samos was an ancient Greek astronomer and mathematician who presented the first known heliocentric model that placed the Sun at the center. So I had to choose the choice that was most similar to that.

6 0

3 years ago

Suppose that two stars in a binary star system are separated by a distance of 80 million kilometers and are located at a distanc

jonny [76]

Answer: 1) Angular separation equals 0.0000031 degrees

2) Angular separation in arc -seconds equals 0.011156"

Explanation:

For 2 stars separated by a distance 'S' and at a distance 'D' from the earth the angular separation in radians is given

$\theta _{rad}=\frac{S}{D}$

Applying values we get

$\theta _{rad}=\frac{80\times 10^{6}}{150\times 9.46\times 10^{12}}\\\\\therefore \theta _{rad}=\frac{1}{18487500}radians$

Now we know that 'π' radians equals 180 degrees thus the above value in degrees shall be equal to

$\therefore \theta _{degrees}=\frac{1}{18487500\times \pi }\times 180^{o}=0.0000031^{o}$

The angular separation in arc- seconds is given by

$\theta ''=\theta ^{o}\times 3600\\\\\theta'' = 0.0000031\times 3600=0.011156"$

8 0

3 years ago

!20 Points!

Ymorist [56]

Answer:

Red coloration--- sedimentary environments

Yellow coloration ---- marine environments

Brown coloration ---- low temperature environments

Explanation:

Coloration of sediment samples indicates the presence of different minerals in these sediment that are found in different type of environment. Red coloration of the sediment sample is the presence of hematite in that environment. The environment that is responsible for the presence of hematite is sedimentary environments whereas, yellows colour result from limonite that is present in shallow swamps, lakes, and marine environments. and brown colour occurs due to the presence of goethite that is found in low-temperature environments.

6 0

3 years ago