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Astronomy is the study that deals with the physics, chemistry, mathematics and the evolution of celestial objects. The objects studied are moons, planets, stars, nebular and galaxies. Astronomers also look at the phenomenon that takes place outside of the Earth’s atmosphere such as supernovae explosions, gamma ray bursts and cosmos background radiation.

Cosmology, although often related, is different than astronomy. Cosmology studies the universe as a whole. Cosmology will be discussed in a later section.

Astronomy is one of the oldest sciences. There have been astronomical artifacts found in early civilizations such as Babylonians, Greeks, Chinese, Indians, Iranians and Maya. It is evident that they performed methodical observations of the night sky. The invention of the telescope however revolutionized modern science. It allowed astronomers to be able to see further into the universe. Before telescopes, the study of the sky was conducted from tall vantage points such as tall buildings and mountains.

Categories within Astronomy


Postings: 25

A layer of gases which surround a material body of sufficient mass.

Kepler's Third Law and Orbital Periods

Dear O.T.A., I need to understand how to calculate the orbital period p of Neptune using Kepler's 3rd Law. The table's value of p = 163.7 years for Neptune . I need to compute a percent error. I'm not even sure what an "AU" is. I hope to calculate/use a value for the Earth's semimajor axis as a = 1.000 A.U., and I kno

Recent discovery in the field of astronomy

I need some help with the following: Use a reliable source to find an article (preferably from a scientific journal) that examines a recent discovery or other current event in the field of astronomy. Review the selected article and write a synopsis of its content. I also need the appropriate citation. Thank you

Astronomy questions

. List the following in order of increasing length size of the Sun distance from the Sun to the Earth size of Jupiter distance to Jupiter distance to the Moon distance to Pluto 2. You are cruising down the highway at 60 mph (100 kph) and, without losing speed you follow the road which veers to the right. Hav

Astronomy Questions

Include at least one reference per question other than self. When looking at the night sky, you can see the light of different stars. If one star looks brighter than another, is it necessarily brighter? Explain. Astronomical discoveries are imperative to science. How are they significant to our personal lives? Explain.

Astronomy: Sunsports, Heal and Planets

Please help answer the following questions. Include references in the solution. 1. Why do Sunspots always appear in pairs? 2. How can astronomers explore the layers of the Sun below its surface? 3. What is the source of heat for the Earth's interior? 4. What are the lunar maria composed of? How did they form? 5. What i

Basic astronomy problems

Four stars of different mass arrive on the Main Sequence of the Hertzsprung-Russell Diagram at the same time. Which star has a mass just about the same as the mass of the Sun? The star with spectral class B7 The star with spectral class F1 The star with spectral class G2 The star with spectral class M4 What is th


1. The two points on Earth intersected by its axis of rotation are known as the __________ and _____________________ . 2. What is the name of the line drawn on Earth dividing it into two equal halves, north and south? 3. Great circles are circles that pass through the North and South Poles on Earth. The Earth is divided

General Astronomy

On a clear sunny day, the sky above us looks bright blue. In the evening, the sunset puts on a brilliant show of reds, pinks and oranges. Why is the sky blue? What makes the sunset red?

Astronomy - Parsec and Hubble's Constant

Question: (1) If a galaxy has a luminosity of 6.6x10^39 W and a brightness measured as 1.25x10^-11 W m^-2, How far away is the galaxy in mega parsecs? (2) An absorption line of the element beryllium is observed in the spectrum of the galaxy above as lying 509.4 nm. What is the speed of the recession of the galaxy in km s^

This posting guides users to write evaluations of poems.

This posting addresses this scenario: As you analyze this work, choose a poem by each of these poets. Then put together a journal entry that carefully evaluates the writing, based on a your 'Reader Response' reading of one (or more) of the poems. Focus on the element described as "romance." Describe the qualities of the poet'

Physics Astronomy

1. How can the different kinds of electromagnetic radiation be described? Please see attached for full problem.

Astronomy in relation to Physics

1. How are forces related to motion? 2. What are momentum and angular momentum? What do they have to do with motion and the orbits of the planets? Please see attached for full question.

Quiz Question

15. Approximately what time could it be if you saw a thin crescent Moon on the western horizon? (a) Sunrise (b) Sunset (c) Noon (d) Midnight (e) Anytime of day or night What is the correct answer?

Astronomy Question

17. Most astronomers consider astrology to be: (a) A science (b) A good way to determine personality traits (c)Helpful in predicting world events (d) More than one of the above (e) None of the above what answer is correct?

Astronomy Question

23. Which of the following would make you weigh half as much as you do right now? (a) Take away half of the Earth's atmosphere. (b) Double the distance between the Earth and the Sun. (c) Decrease the Earth's rate of spin so that 1 day equals 48 hours instead of 24 hours. (d) More than one of these groups (e) None of the a

Contemporay Astonomy

I have given my response to the following chapter quiz questions (see attachment). Please correct and provide the correct answers if/when mine are incorrect. 1.Which of the following lists of different types of electromagnetic radiation is correctly ordered in wavelength, from shortest to longest? A) Gamma rays, ultrav

Magnification of a telescope

The magnification of a telescope with a focal length of 700 mm when a 20-mm eyepiece is used with it is Y. What is Y?

Eclipses, solar and lunar

There can be as many as X eclipses, solar and lunar, in a year, with as few as Y and as many as Z of those being solar eclipses. What are X, Y and Z?

Sun and Moon

When a first quarter Moon is on the meridian, the Sun will be just X. What is X?

Physics and career

My problem is how can physics help us in careers such us biotechnologist, astronomist, geology, biotechnology, aerospace, industry and communications?