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Feedback Q&A on Astronomy

by Ron Kurtus

Readers have sent in a total of 306 comments and questions on Astronomy issues. They are listed according to date.

You can read them to further your understanding of the subject.

List of most recent 10 letters




Moon Characteristics of the Moon India
General Astronomy jobs South Africa
Resources Suggested resource USA
General Math needed for astrophysics studies Pakistan
General I don't understand Astronomy at all Canada
Moon Correcting number of Jupiter's moons USA
General Wants scholarship in Physics USA
Black Holes Can a graviton escape from a black hole? India
The Earth Galaxy versus Galactic motion USA
General Topics Why are orbits elliptical? Nigeria

Next 10

Characteristics of the Moon

Topic: Moon


December 15, 2019

Phisical characteristics on the Moon

Sarat - India



Characteristics of the Moon include its distance from the Earth (384,400 km), diameter (3479 km), mass (7.35*10^22 kg), density (3340 kg/m^3), and temperature (107°C during the day and ?153°C at night).

See Characteristics of our Moon for more information.

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Astronomy jobs

Topic: General


October 27, 2018

In astronomy how long does it take to get that job and how many years in college

Lindiwe - South Africa



You can get some good information from the Astronomical Society of Southern Africa - Astronomy as a Career.

Also see Astronomer Job Descriptions.

Sometimes student internships are available. That is a good was to start.

Best wishes for success in your astronomy career.

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Suggested resource

Topic: Resources


August 3, 2018

Hey !

I was poking around your site, reading all your great content, and I saw you had a resources page here:

Believe it or not, I actually have a article on this exact subject which I think may be beneficial to your readers

as it provides lots of useful information and tips. Check it out: A Guide on Stargazing Looking Through Binoculars

What do you think about adding me to your list?

Talk soon!

Jim - USA



Thanks for suggestion. I added links to your page from Astronomy Resources and Observations in Astronomy.

Best wishes for success in your work.

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Math needed for astrophysics studies

Topic: General


November 28, 2017

hello dear sir,
I want to ask how much mathematics should i learn to understand astrophysics.

jawad - Pakistan



You need Calculus and Differential Equations. Both require a strong background in Algebra and Trigonometry.

Best wishes on becoming an Astrophysicist.

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I don't understand Astronomy at all

Topic: General


February 14, 2017

I don't understand Astronomy at all. I don't enjoy studying about a whole new world that I've never visited. Is their an easy way to understand Triangulation, Radio telescopes?

Jawerriya - Canada



It can be interesting to look into the night sky and see all the numerous stars in the sky, as well as their movement throughout the year. Some people like to learn the constellations and arrangement of the stars.

However, Astronomy can delve deeper to find out what the planets and stars are made of. It is a scientific study that some people are interested in and others are not.

Triangulation is a method to determine distance using trigonometry. In Astronomy, it is useful to approximate distance of far-off objects.

A radio telescope uses radio waves instead of light ways to detect distant objects in space. In some situations, it works better than visible light.

Although teachers can often learning many facts without making the subject interesting, it is good to find things about the subject you like.

Best wishes for success in your studies.

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Correcting number of Jupiter's moons

Topic: Moon


January 24, 2017

On your article about the Earth's Moon, you said the Earth has one Moon and Jupiter has 9 moons. This is incorrect, NASA has recently discovered that Jupiter has 67 moons! I believe the number is up to 67 now. Up until a few years ago, they knew it had at least 63 moons. Galileo discovered 4 of them in the early 1600s. I can only see 5 of them with my modern day, powerful telescope.

David - USA



Thanks for the information. I corrected the Characteristics of our Moon page as well as added material on Jupiter and Jupiter's 67 Moons.

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Wants scholarship in Physics

Topic: General


December 19, 2016

how I get free scholarship by physics?

Minale - USA



Most high schools have lists of scholarships available. Your physics or astronomy teacher should also be able to provide help in getting a scholarship.

Some websites to check include:
SPS Scholarships
Scholarships for Physics Majors

Various colleges also have information on getting a scholarships.

Best wishes for your success in getting an education.

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Can a graviton escape from a black hole?

Topic: Black Holes


May 19, 2016

Does graviton escape from the black holes? If no then why other celestial objects feels their gravity, if yes then how can graviton escape from the place from where even light cant escape?

Vinamra - India



A graviton is a hypothetical particle that is responsible for gravitational forces, as part of the quantum theory of gravitation. Since it is supposed to be the source of gravitational forces through an exchange between masses, it really would not be moving freely like in escaping from a Black Hole.

Other celestial object do feel the gravitational forces from a Black Hole, as witnessed by objects being drawn into the hole. But its forces are reduced as the square of the distance from the Black Hole.

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Galaxy versus Galactic motion

Topic: The Earth


May 1, 2016

What is the difference between Galaxy and Galactic motion?




A galaxy is a system of stars and other materials that are bound together by gravitational forces. The Milky Way is an example of a galaxy.

Galaxies tend to rotate very slowly about some center area. They also move in space as compared to other galaxies.

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Why are orbits elliptical?

Topic: General Topics


February 27, 2016

How does the obit the elliptic

Akin - Nigeria



The orbit of a planet around the Sun should be a circle, however there are gravitational forces from the other planets that distort the orbit into an elliptical shape.

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