by Ron Kurtus
Readers have sent in a total of 303 comments and questions on Astronomy issues. They are listed according to date.
You can read them to further your understanding of the subject.
|Four characteristics of the moon||Moon||South Africa|
|Are there other universes?||General||Pakistan|
|Put solar panels on the Moon||Moon||USA|
|Why study the night sky?||Observations in Astronomy||Australia|
|Are there a lot of galaxies?||General Topics||India|
|Where can I get a telescope?||Observations in Astronomy||Malawi|
|Wants to be an astronaut||General Topics||South Africa|
|Light year is not best for astronomical distances||Astronomical Distances||Turkey|
|Which way does the Earth rotate?||The Earth||New Zealand|
|Where did Mars get its name?||Mars||Philippines|
|Why doesn't the Sun have an atmosphere?||General||Uganda|
|Why can't big bang be a white hole?||General Topics||USA|
|Want to study Astronomy||General Topics||Rwanda|
|Why is the pulsating theory not popular?||General Topics||USA|
|Date when article on Sun was published||General||USA|
Four characteristics of the moon
June 10, 2014
I am asking for 4 characteristics of the moon
sello - South Africa (25048)
The characteristics are listed in Characteristics of our Moon.
You could select size, mass, density, as well as the lack of Oxygen, and lower gravity than Earth.
Are there other universes?
May 26, 2014
is there any other universe?
Akhtar - Pakistan (24990)
It is quite possible that there are other universes. See: Theory of Multiple Universes (Multiverse) for more information.
Put solar panels on the Moon
April 22, 2014
Actually this has to do with solar power. Why not set up a large array of solar panels on the moon, and send the energy back to earth? By using microwave or laser beam technology. We would have an abundance of solar power (electricity). Get rid of nuclear power.
Mark - USA (24890)
Although you could create electricity with the solar panels on the Moon, there would be no good way to send that energy back to the Earth. Perhaps by creating microwaves and sending them back to Earth and then converting the energy to electricity might work. But that is a round-about way of getting the energy and would be very expensive and may not be effective.
There had been talk about placing huge reflective panels in orbit to reflect light to the Earth at night. That idea was dropped a number of years ago as not being practical.
The best solution is using solar panels on Earth, such that the distances are not so immense.
It is great that you are thinking of creative ways to find clean energy. Keep coming up with new ideas.
Why study the night sky?
April 4, 2014
What knowledge modern people gain from studying the night sky?
Roula - Australia (24843)
You can determine direction by observing the stars in the night sky. For the average person, examining the stars and planets through a telescope can be enlightening. Modern scientists can seek out new galaxies and observe events to help understand the physics of the Universe.
Are there a lot of galaxies?
March 2, 2014
Is in universe there are lot of galaxies?
shital - India (24569)
In the Universe, there are billions of galaxies, and within each galaxy, there are billions of stars.
It is hard to imagine such large numbers.
Where can I get a telescope?
December 28, 2013
Please where can i get a Telescope and how much is it?..thank u.
Moses - Malawi (24394)
Although you can order telescopes online through such sites as Amazon.com, it might be better to try a local camera store in Malawi. They often sell telescopes or can direct you to a store that does sell them.
Also, you can try to get a used telescope.
Best wishes in finding a telescope.
Wants to be an astronaut
November 1, 2013
Hi i'm in grade 11 and my biggest dream is to become an astronomar and i want to learn more. I always ador the NASA news.
Thuso - South Africa (24158)
It is great that you have a dream of becoming an astronaut. Many countries are starting to send people into space. However, there are requirements to fulfill to become an astronaut. You should have a college education in the sciences and be in good physical condition.
See details on NASA Astronaut Requirements for some information.
The European Space Agency lists their Training Requirements.
Also see South African Space Programme.
Best wishes in achieving your dream.
Light year is not best for astronomical distances
October 24, 2013
Light year distances: ?t is said to be 1LY=9460730472580,8 km
So 400 Ly=400*9460730472580,8=3784292189032000 km.This to say,that since 400 years,years is accepted 365,25 days.Even for eternity years are accepted to be 365,25 days.No this not correct.Year's days quantity is variable.It has a parabolic graph shape,showing days quantity per real time.
Then big distances should be evaluated with Light day unit.
1 LD=25920000000 km and the totality of days within 400 years is
calculated,with integrals=145732 days.Then the real distance of an object said to be at 400 Ly,is wrong.It is at 145732 ligth day or at
3777363691182340,km.There is a clear difference between LY and LD.
NECAT - Turkey (24127)
The purpose of stating astronomical distances in light years or the distance light travels in an Earth year is for the sake of convenience, since stating the distance in kilometers would be cumbersome.
Yes, it is true that the Earth's year varies, but the resulting difference in distance is insignificance when you are considering the enormous distances in space. Basically, a light year is a good approximation of astronomical distance.
Also, using such a number as 9460730472580,8 km for a light year is not good science, since the number has too many significant places and implies a certain accuracy. The number should be rounded off and put in a scientific notation, such as 9.46E12 km.
A light day could be used to indicate distance, but note that the length of a day is not exactly 24 hour and also varies.
However, it is good that you are looking deeply into how these distances are stated. Best wishes in your Astronomy studies.
Which way does the Earth rotate?
June 21, 2013
If the Earth spins counterclockwise on its axis as mentioned in the article wouldn't the Sun appear to rise in the West?
Rob - New Zealand (23798)
The Earth rotates on its axis from the West towards the East. Viewed from the North Pole, it rotates counterclockwise. However, in New Zealand, you might view it from above the South Pole, such that it rotates clockwise from that perspective.
Where did Mars get its name?
June 10, 2013
from where did gets mars name ?
hermie james - Philippines (23764)
Since Mars has a reddish glow, the ancient Romans related it to blood and named the planet after their god of war, Mars.
Why doesn't the Sun have an atmosphere?
May 6, 2013
Why do the sun has no atmosphere?
Kwemoi - Uganda (23669)
An atmosphere is a layer of gasses surrounding a planet or even star.
The atmosphere of the Earth is made up of air, including oxygen and nitrogen. The Sun also has an atmosphere, but it is made up of extremely hot gases, such as hydrogen and helium.
Why can't big bang be a white hole?
May 3, 2013
why can't big bang be a white hole??
kritika - USA (23665)
While a Black Hole is an area in space where matter can enter but light and matter cannot escape, a White is just the opposite: Light and matter cannot enter but it can escape.
There are theories that the Big Bang came from a White Hole.
Want to study Astronomy
March 20, 2013
How can i get to study astronomy on scholarship in Canada ? what are the most important subjects in order to study astronomy?
mpore - Rwanda (23552)
See Astronomy Scholarships in Canada for a small listing. It is a start.
Physical Science gives and overview of Astronomy. Physics, Astrophysics, and Chemistry are usually needed. Also, higher Mathematics courses are required.
Best wishes in becoming an Astronomer.
Why is the pulsating theory not popular?
March 4, 2013
sir, i want to know that why is pulstating theory is not widely acceptable
kritika - USA (23518)
The three main theories of the behavior of the Universe are the Big Bang Theory, the Steady State Theory, and the Pulsating Theory.
In the 1920s, Albert Einstein believed in the cyclical or pulsating theory, but in 1934 it was proved that the theory fails because--according to the Second Law of Thermodynamics--entropy can only increase.
However, there are some new theories to explain the cyclical or pulsating view of the Universe. Still, the Big Bang theory seems more appealing to astronomers.
Date when article on Sun was published
February 19, 2013
When was your article on the Suns Characteristics published?
- USA (23211)
The date is right under the title: 11 April 2009
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