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Astronomy Feedback

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.



List of next 15 letters

Title

Topic

Country

Not on other planets The Earth Philippines
 
I think this is great! Observations USA
 
What does the Earth do on its axis? The Earth USA
 
When is the end of the Earth? Constellations Nepal
 
What's the difference between a meteor and meteorite? Observations Canada
 
Why is the moon crescent at the bottom? Our Moon USA
 
Does the sun shines on every place of the moon? Our Moon Belgium
 
Big Dipper and Little Dipper Constellations USA
 
Why are the planets all in different shapes? Observations USA
 
I believe the Sun travels around the Earth The Earth Lebanon
 
At what height is there no gravity from Earth? Observations Pakistan
 
How can we prove the Moon rotates on its axis? Our Moon Pakistan
 
Why would object that fell into black hole look red? Black Holes USA
 
Want to make a model of the Solar System Our Solar System Pakistan
 
How does the Earth keep the Moon in orbit? Orbital Motion USA
 

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First 15 letters


The Earth

Not on other planets

November 24, 2008

Question

what are the characteristics of earth which can't be found on other planets

raul - Philippines (16848)

Answer

Life, humans, moderate temperature range, oxygen atmosphere

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Observations

I think this is great!

November 19, 2008

Question

I think this is great! It's a really good way to teach people about astronomy (and other subjects). The page was well written, and having a narrating device was also good. Additionally, the mini-quiz at the end was also a good idea. This is really cool, if you ask me! :) Keep up the great work.

Kristin - USA (16831)

Answer

Thanks for the feedback. I'm glad you liked the material and the approach. And we'll be sure to keep up the good work.

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The Earth

What does the Earth do on its axis?

November 9, 2008

Question

can u tell me the answer to this question please? my question is =As Earthrevolves around the sun,it also [blank] on its axis. i cant figure out the blank , thank you

payton - USA (16755)

Answer

The Earth tilts on its axis, resulting in the seasons as it goes around the Sun.

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Constellations

When is the end of the Earth?

June 1, 2008

Question

what is the date of ending of earth?

pradeep - Nepal (16027)

Answer

The end of the Earth as a planet may be in billions of years, after the Sun has lost its power. The end of mankind or life on Earth could be in 10,000 years or more. Some religions say that man will destroy himself.

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Observations

What's the difference between a meteor and meteorite?

May 11, 2008

Question

What's the difference between a meteor and a meteorite

Diana - Canada (15933)

Answer

A meteorite is a meteor makes it to the ground without burning up.

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Our Moon

Why is the moon crescent at the bottom?

March 12, 2008

Question

I thought a crecent moon always appeared vertically either to the left or right of the moon. I have noticed during the last two months that the crecent appears at the "bottom" like a bowl. Why is that?

D. - USA (15522)

Answer

The path of the moon and the angle from the Sun occasionally allow for the crescent to be at the bottom or at the top.

There is an old sailor's saying that if the moon appears like the bottom of a bowl that there will be rain soon. The problem with that saying is that people from a large part of the world see the same view.

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Our Moon

Does the sun shines on every place of the moon?

December 1, 2007

Question

Hello,

I have a quick question concerning the sun, moon and earth.

Does the sun shines on every place of the moon during one tour of the earth around the sun?

Best regards,

Reinhart - Belgium (14886)

Answer

Since the Moon shows the same face to the Earth as it rotates around the Earth, the Sun should shine on every place during that rotation. The Moon goes around the Earth about 12 times a year, so all parts of the Moon would be exposed to the Sun many times a year.

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Constellations

Big Dipper and Little Dipper

November 30, 2007

Question

Hi,
my father and i are having a... discusion about the North Star. i just looked up how to find it but got us to another,discution, about if you can see BOTH the Big AND the Little Dipper At the SAME TIME. Is it true that you CAN see both at the same time?
Thank you

- USA (14879)

Answer

The Big Dipper (Ursa Major) and the Little Dipper (Ursa Minor) can be seen at the same time. A picture of them is at: http://www.allthesky.com/various/umaumi.html

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Observations

Why are the planets all in different shapes?

November 25, 2007

Question

why are the planets all in different shapes?
who was the first man to step on the moon?

Sonia - USA (14848)

Answer

Most planets are spherical in shape, but slightly oval from spinning while cooling down from a liquid state. On the other hand, asteroids may have odd shapes if they had broken away from a planet or where formed by an explosion or collision.

Neil Armstrong was the first man on the Moon.

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The Earth

I believe the Sun travels around the Earth

November 25, 2007

Question

the earth is constant.its fixed.the sun is the one which revolutes around it.
if earth is moving,then how is the behavior of light.the speed of light is 3 multiplied by 10^5 km/s.which means the light will fit every single point on the earth,which is not true.when there is a morning in china,its night at america.if the earth rotates of speed 30km/s,then the light will reach america since its speed is much higher than that of the earth.
the other seasons do not come due to the motion of the earth.
in fact the earth is centered.there exist a large circle in space in which the sun lies on and moves around the earth.there exist another huge imaginary circles in space in which the moon lies on.
now,note clearly about this question.what is the smallest creature we have ever discovered?
its the atom.the atom consist of nucleus and electron cloud.the nucleas is centered,and the electrons revolute aroud the nuclues on the electron clouds(the circles).but the helium atom has 2 electrons and hence two electron cloud.therefore our huge huge universe is a module of the helium atom which is the smallest creature we have ever discoved!
why do you thing we are subjected to the universal gravitation?
the protons affects the electrons with a force in the atom.
therefore,the earth has a charge,affecting both the sun and the moon with a costant force 10N/kg.which can be identified:f=k(q1)(q2)/d^2
but we need to figure out the distance to know the real charge.

Abdul Rahman - Lebanon (14844)

Answer

The ideas that you have were popular in science a long time ago. Since then, new discoveries and measurements have brought about new concepts. Many of our lessons explain those concepts, which are now accepted as true.

The Sun only appears to move around the Earth, because of our perspective. It was proven over 300 years ago from measurements of the movement of the planets, that the Earth and the planets revolve around the Sun. This has also been shown by pictures taken from space vehicles.

Einstein's Theory of Relativity states that the speed of light is constant no matter how fast an object travels.

100 years ago, the atom was though of as the smallest item. Since then, there have been numerous particles discovered that are much smaller than the atom.

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Observations

At what height is there no gravity from Earth?

November 5, 2007

Question

on which height there is no earth's gravity.

monna - Pakistan (14707)

Answer

The force of gravity from the Earth can be measured far into space. Likewise, we feel the gravity from the Sun and the Moon, as it affects the tides.

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Our Moon

How can we prove the Moon rotates on its axis?

November 5, 2007

Question

moon rotates about its axis how can we prove it

monna - Pakistan (14708)

Answer

If you look at the Moon as it rotates around the Earth, you will see the same side of the Moon facing you. That means the Moon is rotating on its axis at the same rate as it revolves around the Earth. If it did not rotate, you would see the other side of the Moon.

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Black Holes

Why would object that fell into black hole look red?

November 4, 2007

Question

Why would an object that fell into a black hole have its color turn to a rusty red once it has passed the event horizion? Does this have something to do with the time dilation... The light shifting to the red end of the spectrum or something? Thank you!

Maria - USA (14702)

Answer

When objects that give off light, such as a star or sun, are moving away from us, their light becomes more red. This is called the red-shift. Thus, as such an object started to speed toward the black hole, it would appear to us to be more red than yellow.

Anything inside the event horizon of a black hole will not escape, including light. That is why is it called a black hole. You would not be able to see light from an object within the event horizon.

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Our Solar System

Want to make a model of the Solar System

October 27, 2007

Question

i want to make model of solar system with balls. give me some idea and way

monna - Pakistan (14655)

Answer

First draw a picture of the Solar System with the Sun and planets to get a good perspective on it. The biggest problem in making such a model is holding the planets in place.

A basketball would be good as the Sun, because it is large and orange colored. You could use different sized balls to represent the planets. Attaching a stiff wire between the planet and the Sun is the usual method.

A fun method is to give other students various balls and then have them walk around a student in the middle holding the Sun.

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Orbital Motion

How does the Earth keep the Moon in orbit?

October 27, 2007

Question

Very great explaination of Keplllers Law.
I have a question that:Moon orbits around the earth, is a combination of two forces: Motion in straigth line and a "fall" towards the earths centre. how do these two motions deplict and how they act to keep the moon "trapped" in orbit.

Thank you

Ali - USA (14659)

Answer

If you put a weight on a string or rope and swing it around you, it is like the Moon traveling around the Earth. The string acts like gravity keeping the weight in orbit. If you let go of the string, the weight will fly off in a straight line.

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