Question 311 pts Which of the following spiral arms is the sun presently found i

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Question 311 pts

Which of the following spiral arms is the sun presently found in or near?

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Question 321 pts

Which of the following is arranged in approximate order of increasing gas, dust, and rate of star formation?

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Question 331 pts

What is the spectral class and classification of our Sun?

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Question 341 pts

The Sun transfers energy to its outside first by ___________, then by____________

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Question 351 pts

Which of the following statements is TRUE ?  

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Question 361 pts

What is the most abundant type of binary star system?  

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Question 371 pts

If the absolute magnitude of a star A on the Hipparchus scale is +10 and star B is 0, then star A is

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Question 381 pts

If a star is 4 times the temperature of the sun and 5 times its size, how much more Luminous will it be?

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Question 391 pts

Which of the following is associated with a T Tauri Star?

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Question 401 pts

The most common kind of star in space is a  

Explanation / Answer

Question 311 pts Which of the following spiral arms is the sun presently found in or near?

Answer: the Orion spiral arm

Clarification:

Our local Orion Arm of the Milky Way is some 3,500 light years across. It’s approximately 10,000 light years in length. Our sun, the Earth, and all the other planets in our solar system reside within this Orion Arm. We’re located close to the inner rim of this spiral arm, about halfway along its length.

Question 321 pts

Which of the following is arranged in approximate order of increasing gas, dust, and rate of star formation?

Could not answer. Clearly not known

Question 331 pts

What is the spectral class and classification of our Sun?

Answer: G2 V

Clarification:

The Sun is a as a G2V type star, a yellow dwarf and a main sequence star. Stars are classified by their spectra (the elements that they absorb) and their temperature. There are seven main types of stars. In order of decreasing temperature, O, B, A, F, G, K, and M

Question 341 pts

The Sun transfers energy to its outside first by ___________, then by____________

Answer: radiation, emission

Clarification:

The Sun is the source of energy for most of life on Earth. As a star, the Sun is heated to high temperatures by the conversion of nuclear binding energy due to the fusion of hydrogen in its core. This energy is ultimately transferred (released) out into space mainly in the form of radiant (light) energy and then the lower energy state is called as emission.

Question 351 pts

Which of the following statements is TRUE ?

Answer: The true Statement is W Ursae Majoris is an example of an eclipsing binary system.

Clarification:

A W Ursae Majoris variable, also known as a low mass contact binary, is a type of eclipsing binary variable star. These stars are close binaries of spectral types F, G, or K that share a common envelope of material and are thus in contact with one another. They are termed contact binaries because the two stars touch and transfer mass and energy through the connecting neck.

Question 361 pts

What is the most abundant type of binary star system?

Answer: Visual binaries

Clarification:

These are most common and constitute 5 to 10% of whole sytem.

Question 371 pts

If the absolute magnitude of a star A on the Hipparchus scale is +10 and star B is 0, then star A is

Answer: 10,000 times dimmer

Clarification:

The brighter an object appears, the lower the value of its magnitude, with the brightest objects reaching negative values. The Sun has an apparent magnitude of ?27, the Moon ?13 at full phase, the brightest planet Venus up to ?5, and Sirius, the brightest visible star in the night sky, ?1.5. Apparent magnitudes can also be assigned to artificial objects in Earth orbit. The brightest satellite flares are ranked at ?9, and the International Space Station (ISS) appears at a magnitude of ?6.

So a 1st magnitude star is 2.512 times brighter than a 2nd magnitude star, and 2.5122=6.31 times brighter than a 3rd magnitude star, and 2.5123=15.9 times brighter than a 4th magnitude star, 2.5124=39.8 times brighter than a 5th magnitude star, and 2.5125=100 times brighter than a 6th magnitude star.

Question 381 pts

If a star is 4 times the temperature of the sun and 5 times its size, how much more Luminous will it be?

Answer: 6,400

Question 391 pts

Which of the following is associated with a T Tauri Star?

Answer: Herbig Haro Object

Clarification:

Herbig-Haro objects are small patches of nebulosity associated with newly-born stars, and are formed when gas ejected by young stars collides with clouds of gas and dust nearby at speeds of several hundred kilometres per second.

Question 401 pts

The most common kind of star in space is a  

Answer: red dwarf

Clarification:

Red dwarfs are by far the most common type of star in the Milky Way, at least in the neighborhood of the Sun, but because of their low luminosity, individual red dwarfs cannot be easily observed. From Earth, not one is visible to the naked eye.

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