Which of the following statements in correct? Galaxies generally contain between 106 and 1012 stars. Nebula is a cloud of gas and dust floating in space. Saros period is of 18 years and 11.3 days during which the Sun, Earth and Moon return to almost the same relative positions. Geodesy refers to the study of the shape and the gravitational field of the Earth upon data collected from artificial satellites.a)I and IIb)II, III and IVc)II and IIId)I and IVCorrect answer is option 'B'. Can you explain this answer?

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Which of the following statements in correct?

Galaxies generally contain between 106 and 1012 stars.
Nebula is a cloud of gas and dust floating in space.
Saros period is of 18 years and 11.3 days during which the Sun, Earth and Moon return to almost the same relative positions.
Geodesy refers to the study of the shape and the gravitational field of the Earth upon data collected from artificial satellites.

a)
I and II
b)
II, III and IV
c)
II and III
d)
I and IV

Correct answer is option 'B'. Can you explain this answer?

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Which of the following statements in correct? Galaxies generally conta...

Correct option is B

The Sun belongs to a galaxy called the Milky Way. Astronomers estimate there are about 100 thousand million stars in the Milky Way alone. Outside that, there are millions upon millions of other galaxies also!

A nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form. A nebula is a giant cloud of dust and gas in space.

The periodicity and recurrence of eclipses is governed by the Saros cycle, a period of approximately 6,585.3 days (18 years 11 days 8 hours). It was known to the Chaldeans as a period when lunar eclipses seem to repeat themselves, but the cycle is applicable to solar eclipses as well.

Geodesy is the science of accurately measuring and understanding the Earth's geometric shape, orientation in space, and gravity field. Today, geodesists use space-based tools like the Global Positioning System (GPS) to measure points on the Earth's surface.

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Which of the following statements in correct? Galaxies generally contain between 106 and 1012 stars. Nebula is a cloud of gas and dust floating in space. Saros period is of 18 years and 11.3 days during which the Sun, Earth and Moon return to almost the same relative positions. Geodesy refers to the study of the shape and the gravitational field of the Earth upon data collected from artificial satellites.

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Which of the following statements in correct? Galaxies generally contain between 106 and 1012 stars. Nebula is a cloud of gas and dust floating in space. Saros period is of 18 years and 11.3 days during which the Sun, Earth and Moon return to almost the same relative positions. Geodesy refers to the study of the shape and the gravitational field of the Earth upon data collected from artificial satellites.a)I and IIb)II, III and IVc)II and IIId)I and IVCorrect answer is option 'B'. Can you explain this answer?

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