The correct answer is A. Black holes.

Here's the step by step reasoning:

A. Black holes - Black holes are regions of space where gravity is so strong that nothing, not even light, can escape their pull. They were not known to astronomers before the invention of the telescope because they are invisible and can only be detected with modern technology.

B. Motion of stars - Ancient astronomers were able to track the motion of stars across the sky. They used this information to create calendars and navigate.

C. Phases of the Moon - The phases of the Moon were well known to ancient astronomers. They could easily be observed with the naked eye.

D. Visibility of planets - The five planets visible to the naked eye (Mercury, Venus, Mars, Jupiter, and Saturn) were known to ancient astronomers. They were often mistaken for stars, but their motion across the sky revealed their true nature.

So, the astronomical phenomena not known to astronomers before the invention of the telescope is Black holes.

Question

The correct answer is A. Black holes.

Here's the step by step reasoning:

A. Black holes - Black holes are regions of space where gravity is so strong that nothing, not even light, can escape their pull. They were not known to astronomers before the invention of the telescope because they are invisible and can only be detected with modern technology.

B. Motion of stars - Ancient astronomers were able to track the motion of stars across the sky. They used this information to create calendars and navigate.

C. Phases of the Moon - The phases of the Moon were well known to ancient astronomers. They could easily be observed with the naked eye.

D. Visibility of planets - The five planets visible to the naked eye (Mercury, Venus, Mars, Jupiter, and Saturn) were known to ancient astronomers. They were often mistaken for stars, but their motion across the sky revealed their true nature.

So, the astronomical phenomena not known to astronomers before the invention of the telescope is Black holes.

Knowee AI · Accepted Answer

The correct answer is A. Black holes.

Here's the step by step reasoning:

A. Black holes - Black holes are regions of space where gravity is so strong that nothing, not even light, can escape their pull. They were not known to astronomers before the invention of the telescope because they are invisible and can only be detected with modern technology.

B. Motion of stars - Ancient astronomers were able to track the motion of stars across the sky. They used this information to create calendars and navigate.

C. Phases of the Moon - The phases of the Moon were well known to ancient astronomers. They could easily be observed with the naked eye.

D. Visibility of planets - The five planets visible to the naked eye (Mercury, Venus, Mars, Jupiter, and Saturn) were known to ancient astronomers. They were often mistaken for stars, but their motion across the sky revealed their true nature.

So, the astronomical phenomena not known to astronomers before the invention of the telescope is Black holes.

Which of the following is not an example of astronomical phenomena known toastronomers before the invention of telescope?A. Black holes B. Motion of stars C. Phases of the Moon D. Visibility of planets

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