Questions and Answers for Astronomy

Astronomy

What did Nicolaus Copernicus contribute to science? Did he futhered human knowledge of the solar system or did he...

Nicolaus Copernicus is not famous for his contributions to reproductive science, but rather for his contributions to ASTRONOMY. (Although he did work as a physician for a time, studying medicine,...

Latest answer posted January 23, 2014 9:41 pm UTC

2 educator answers

Astronomy

What is a prostar?

There are nine different stages that a star must pass through before being “born.” The first stage is when a nebula collects and makes a mass of gas and dust then it begins to contract under its...

Latest answer posted February 4, 2009 9:34 am UTC

1 educator answer

Astronomy

How Many Moons Does The Sun Have

The sun doesn't have any moons. A moon is a natural satellite that orbits around a planet. Since the sun is classified as a star and not as a planet, it has no moons. There are 9 planets that orbit...

Latest answer posted November 19, 2008 3:35 am UTC

2 educator answers

Astronomy

what is the difference between black holes and neutron stars?

Both Black holes and neutron stars are product of a dying star. When a star dies, it spent all of its energy and then collapses. Their difference lies on their parent star. For the purpose of this...

Latest answer posted October 31, 2012 11:11 am UTC

1 educator answer

Astronomy

Explain why the Moon exerts a greater tidal influence on the Earth than the Sun.

Even though the Sun is much farther away from the Earth than the Moon, it exerts a stronger gravitational pull because it is so huge. However, the sun exerts a smaller tidal influence on Earth...

Latest answer posted February 1, 2009 3:56 am UTC

1 educator answer

Astronomy

How does a space shuttle land on the moon after taking off from the Earth?

Actually, the recently retired space shuttle line of space vehicles never landed on the moon. The lunar landings were conducted between 1969 and 1972 with the Apollo missions. The space shuttle...

Latest answer posted November 28, 2012 2:44 am UTC

1 educator answer

Astronomy

Why is the solar system called a system?

According to the enotes dictionary, the definition of a system is that it is "A group of interacting, interrelated, or interdependent elements forming a complex whole" The concept of a system is...

Latest answer posted February 3, 2009 12:51 pm UTC

1 educator answer

Astronomy

During a solar eclipse,the moon(of mass 7.36x10^22kg), Earth(of mass 5.98x10^24kg), and Sun(of mass 1.99x10^24) lie...

The force exerted by the moon on the Earth is 2.98 x 10^31 joules. The gravitational force exerted by the Earth on the Sun is 3.58 x 10^23 joules These figures are derived by using the following...

Latest answer posted November 23, 2009 11:28 pm UTC

1 educator answer

Astronomy

How are the expanding universe and the Doppler effect related to one another?

The Doppler Effect is evidence that the universe is expanding. When stars or galaxies are moving away from us, we see their color as red shifted. Because the distant galaxies are red shifted, this...

Latest answer posted October 22, 2008 1:29 pm UTC

1 educator answer

Astronomy

True or false? Pluto was designated as a dwarf planet in the year 2006.

This is true; Pluto was reclassified as a dwarf planet in 2006. There are several reasons for this reclassification, and for why Pluto was originally considered a planet. Pluto was considered a...

Latest answer posted January 14, 2014 4:49 pm UTC

2 educator answers

Astronomy

How many moons does each planet have?   name of the moons

No one knows. New moons are discovered around the outer planets with fair regularity, the most recent of which was a fourth moon of Pluto's Please note that there have also been new planets...

Latest answer posted February 18, 2012 9:18 am UTC

2 educator answers

Astronomy

Why do we live on earth? Why can't we live on other planets??

The first part of this question has been thoroughly answered. However, the second part comes from an incorrect premise. We can live on other planets. It's just that we need a very large amount of...

Latest answer posted July 9, 2014 1:02 am UTC

3 educator answers

Astronomy

What are the major life-supporting factors on Earth?

First, of all the planets around the Sun, the Earth has, through the laws of physics, maintained an atmosphere. This atmosphere serves two specific purposes in sustaining life. First, it protects...

Latest answer posted November 2, 2012 10:05 pm UTC

1 educator answer

Astronomy

Circle formulae. Geometry. A small probe is exploring a spherical asteroid. As the probe creeps over the surface,...

The asteroid is a perfect sphere so the perimeter is given by `P = 2 pi r ` where `r ` is the radius of the sphere. The landing craft is 10km due 'North' of the drilled hole. Where 'North' is...

Latest answer posted October 5, 2015 5:15 pm UTC

2 educator answers

Astronomy

How are Astronomical Units different from Light-Years?

Astronomical Units (AU) and Light-Years (ly) are both measurements of distance, generally used to show large amounts of distance between points. Light-years are better suited for calculating the...

Latest answer posted January 10, 2012 8:35 am UTC

1 educator answer

Astronomy

What did Newton discover about gravity? Multiple Choice: A) Any force on a planet would be directed along its path...

Some of the options provided are completely false, others are true, but were not discovered by Newton. Newton's discovery was D, that gravity is a universal phenomenon. While it is true that all...

Latest answer posted November 22, 2009 10:35 pm UTC

1 educator answer

Astronomy

When and how did Pluto die?

I once read from a college textbook on astronomy published in the 1880's that the Solar System was composed of 4 small rocky planets, surrounded by 4 large gas giant planets. With our current...

Latest answer posted February 20, 2010 12:13 am UTC

2 educator answers

Astronomy

What is the most commonly accepted theory on how the universe was formed?

The most commonly accepted theory on the formation of the universe is what is known as "the Big Bang" theory. Many astronomers believe that the origins of the universe began with the concentration...

Latest answer posted May 20, 2013 12:29 am UTC

1 educator answer

Astronomy

Given: G=6.67259 x 10^-11 N m^2/kg^2 Mimas, a moon of Saturn, has an orbital radius of 1.88 x 10^8 m and an orbital...

Newton realized that two bodies orbit around a common center of mass, rather than one round the other. He therefore modified Kepler's 3rd Law to: (m1 + m2) P^2 = (d1 + d2)^3 = R^3 where R is the...

Latest answer posted November 23, 2009 12:34 am UTC

1 educator answer

Astronomy

How far away in parsecs is the star Spica if its parallax is 0.0120”? How far away is Spica in light-years and in...

In astronomy, a parallax refers to the angular distance between a celestial body and the observation point at earth's surface. Since we see the celestial body up in the sky, we measure the distance...

Latest answer posted February 5, 2015 7:36 am UTC

1 educator answer

Astronomy

Suppose the Sun were twice as massive as it actually is. What would be the orbital period of a planet at a distance...

The period of a planet orbiting a round a star, for example, the Sun, relates to th=e radius of the orbit according to the third Kepler's Law: `T^2 = (4pi^2)/(GM) a^3` Here, T is the period of the...

Latest answer posted September 9, 2015 11:29 pm UTC

1 educator answer

Astronomy

What role did the "frost line" play in the outer planets growing so much more massive than the inner planets?

The planets in our Solar System can be generally divided into two different groups, the terrestrial planets and the gas giants. The terrestrial planets are closer to the Sun and consist of...

Latest answer posted July 25, 2013 1:09 am UTC

2 educator answers

Astronomy

Why should humans study astronomy?

Astronomy should be studied by mankind because our survival is directly linked to the cosmos. The Earth is heated by its nearest star, the Sun, and its ocean tides are directly connected to its...

Latest answer posted September 4, 2013 2:55 am UTC

1 educator answer

Astronomy

What is the most volcanically active body in the solar system?

I think most people would be surprised to find out that the most volcanically active body in the solar system is actually one of Jupiter's moons, Io. It has more than 400 volcanoes, and the amount...

Latest answer posted November 3, 2011 9:07 am UTC

1 educator answer

Astronomy

What is the primary evidence that a large asteroid impact is associated with the extinction of the dinosaurs? a. a...

The answer to the question is A. While it is true that there are large impact craters all over the world and the Earth's magnetic poles have reversed several times over the course of geological...

Latest answer posted March 20, 2013 3:49 am UTC

1 educator answer

Astronomy

True\False question: Newton's gravity would explain why Saturn, so far from the Sun, moves so slowly across the sky....

Absolutely True! Isaac Newton postulated that the force of gravity is a universal force that acts between any two masses in direct proportion to their masses and in inverse proportion to the...

Latest answer posted February 19, 2012 4:38 am UTC

2 educator answers

Astronomy

How might a major asteroid impact have caused a mass extinction of the Earth's plant and animal species at certain...

A lot of scientists believe that the major example of how this happened was the asteroid impact that (many believe) had a lot to do with the extinction of the dinosaurs. The way this works is...

Latest answer posted March 10, 2010 12:58 pm UTC

1 educator answer

Astronomy

How does a spectroscope enable astronomers to determine the characteristics of distant stars and galaxies?

Around 1859 the German chemists Robert Wilhelm Bunsen and Gustav Robert Kirchhoff began to examine the light generated when elements were heated to incandescence. By passing that light through a...

Latest answer posted May 15, 2009 3:57 am UTC

1 educator answer

Astronomy

Mercury is .387 times Earth's distance from the Sun, Pluto is 39.53 times the Earth's distance from the Sun. If the...

The angular diameter of an object is the size of the object expressed as an angular measurement when it is viewed from a particular spot. If an object is at a distance D from the point it is being...

Latest answer posted September 16, 2015 4:58 am UTC

1 educator answer

Astronomy

Why is the universe so vast, huge and immense?

The scientific answer to your question is would be that before the "big bang" all matter in the universe was condensed into a tiny fragment called "the singularity". Scientists...

Latest answer posted October 19, 2008 2:28 am UTC

1 educator answer

Astronomy

How, in olden days, did people tell time by seeing the position of stars?

Using the stars to tell time is actually very complicated (much more difficult than using the sun or the moon). Whereas using the sun to denote time is relatively simple (when the sun is directly...

Latest answer posted June 22, 2012 9:35 pm UTC

1 educator answer

Astronomy

What does a star’s red color indicate?

The color of a star helps to indicate the age of the star by reflecting the type of element that is burning in the nuclear reactions within the star. A red star is one that has burned all of the...

Latest answer posted July 3, 2012 1:26 am UTC

1 educator answer

Astronomy

What are the Moon phases and their influences on Earth?

The word "lunatic" derives from the latin word "luna," which means moon. The word "moon" itself comes from Anglo-Saxon; the modern English word "month" comes from "moonth," describing one cycle...

Latest answer posted January 16, 2010 7:15 am UTC

1 educator answer

Astronomy

What evidence exists that the universe is changing?

There is overwhelming physical evidence that the universe is changing. The debate among astronomers is over whether the universe is expanding, a completely different question. The universe is...

Latest answer posted May 17, 2013 11:59 pm UTC

1 educator answer

Astronomy

Why does the Earth move from west to east?

If you were able to look down upon the Earth above the North Pole, you would see the planet rotating counterclockwise. For an observer on the planet surface, this motion generates the illusion...

Latest answer posted May 9, 2009 6:50 pm UTC

1 educator answer

Astronomy

The Sun is about 300,000 times as massive as the Earth. Calculate the radius of the Sun's orbit about its common...

Question one regards barycentric coordinates. The center of mass in the Sun-Earth relationship is not at the center of either body; it is a sort of average between the two. I can tell you without...

Latest answer posted January 16, 2014 7:46 pm UTC

1 educator answer

Astronomy

Calendar

The question of who invented the first calendar is very hard to answer -- no one knows for sure. Many ancient societies had them. The Egyptians are, however, credited with the first solar...

Latest answer posted October 21, 2009 11:12 am UTC

1 educator answer

Astronomy

What is the big bang theory?

The Big Bang theory is an attempt to deal with the observed reality of an expanding universe. That is to say, in the wake of observations showing that all galaxies are moving away from one another,...

Latest answer posted April 7, 2008 10:11 am UTC

1 educator answer

Astronomy

Comets Why do comets have tails? Why do the tails point away from the Sun? 

Comets have tails (two of them, in fact) because of stuff coming off the comet's core. One of the tails is made of dust. The other tail is made of gasses. Both of these tails point more or less...

Latest answer posted March 10, 2010 1:04 pm UTC

1 educator answer

Astronomy

rotation and revolution. Can anybody make it clear to me what reason lies behind rotation and revolution of a...

Although these terms may be used interchangeably, in referencing celestial bodies they may have different meanings. Rotation means a body spinning about its own axis, whereas revolution means a...

Latest answer posted April 11, 2009 1:27 pm UTC

1 educator answer

Astronomy

Why does Mars have a longer year than Earth?

The Martian Year can be expressed either in Earth Days (It takes 686.9726 Earth days for Mars to complete an orbit of the Sun.) But the Martian Day is different also, about 24 (Earth) hours and...

Latest answer posted December 8, 2008 6:52 am UTC

1 educator answer

Astronomy

Who was the first person to orbit Earth? please describe briefly

Russian Yuri Gargain was the first man to orbit the earth. He orbited the earth once before returning to earth about 90 minutes later.

Latest answer posted August 31, 2008 12:05 pm UTC

1 educator answer

Astronomy

I was watching When Aliens Attack on National Geographic. If aliens are so smart with all their technology, I feel...

National Geographic's 2011 docudrama When Aliens Attack is as much a work of science fiction as it is a documentary. That means that, while much of the details incorporated into the film are...

Latest answer posted June 21, 2017 1:19 am UTC

4 educator answers

Astronomy

Briefly describe the origin of the universe.

The most commonly believed theory on this among scientists is what is known as the "big bang" theory. This idea holds that the universe was created by a huge explosion. The universe, according to...

Latest answer posted February 3, 2010 12:12 pm UTC

1 educator answer

Astronomy

Is there gravity in space? Explain why? please

Gravitational attraction is inversely proportional to the square of the distance from the center of gravity of a mass. In theory, there is no "cutoff" or "horizon" where the gravitational...

Latest answer posted June 10, 2009 7:16 am UTC

1 educator answer

Astronomy

the earth we live on is dying!!!!! We need to look after the earth or it will die and we will die!!!

Actually, the Earth will be fine - the planet has been here for a very long time and will continue to do so long after we as a human species are gone. With climate change, pollution and...

Latest answer posted June 20, 2010 9:50 pm UTC

1 educator answer

Astronomy

How can you find the Little Dipper and/or the Big Dipper in the night sky? I live in Denver, CO and sometimes when I...

The constellation known as The Little Dipper is part of a larger constellation known as Ursa Minor, or The Little Bear. It possesses the star Polaris in the very end of it's handle. Polaris is...

Latest answer posted February 1, 2012 2:29 am UTC

1 educator answer

Astronomy

Why and how did Pluto die?

It isn't that Pluto died per se. Instead, Pluto is what it always has been—or at least, what it has been for millions, perhaps billions, of years. It's a small, rocky, planetoid. What happened was,...

Latest answer posted November 18, 2008 7:46 am UTC

1 educator answer

Astronomy

Two stars are observed in the sky. Star A appears 2.5 times brighter than star B, and star A is 4 times nearer than...

The brightness that we see is related to two factors: how much brighter one star is than another and how much closer one is than another. The brightness decreases by the square of the distance....

Latest answer posted June 11, 2010 1:40 am UTC

1 educator answer

Astronomy

What is the sidereal time when Cassiopeia is on the meridian? Use 1 hour for the right ascension.

Assuming that Cassiopeia has a right ascension of `approx ` 1hr (for example using `gamma ` Cas, the star in the center of the 'W'), then the sidereal time when Cassiopeia is on the meridian...

Latest answer posted September 23, 2015 10:15 pm UTC

1 educator answer

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