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Royal Astronomical Society of Canada: http://www.rasc.ca/. Unites professional and amateur astronomers around Canada; has 28 centers with local activities, plus national magazines and meetings.

Some astronomical publications students can read

Astronomy Now : http://www.astronomynow.com/. A colorful British monthly, with excellent articles about astronomy, the history of astronomy, and stargazing.

Astronomy : http://www.astronomy.com. Has the largest circulation of any magazine devoted to the universe and is designed especially for astronomy hobbyists and armchair astronomers.

Free Astronomy : http://www.astropublishing.com/. A new web-based publication, with European roots.

Scientific American : http://www.sciam.com. Offers one astronomy article about every other issue. These articles, a number of which are reproduced on their website, are at a slightly higher level , but—often being written by the astronomers who have done the work—are authoritative and current.

Sky&Telescope : http://skyandtelescope.com. An older and somewhat higher-level magazine for astronomy hobbyists. Many noted astronomers write for this publication.

Sky News : http://www.skynews.ca/. A Canadian publication, featuring both astronomy and stargazing information. It also lists Canadian events for hobbyists.

StarDate : https://stardate.org/. Magazine that accompanies the brief radio program, with a useful website for beginners.

Sites that cover astronomy news

Exploring the Universe: http://fraknoi.blogspot.com. An astronomy news blog by one of the original authors of this textbook.

Portal to the Universe: http://www.portaltotheuniverse.org/. A site that gathers online astronomy and space news items, blogs, and pictures.

Science@NASA news stories and newscasts: http://science.nasa.gov/science-news/. Well-written stories with, of course, a NASA focus.

Space.com: http://www.space.com/news/. A commercial site, but with wide coverage of space and astronomy news.

Universe Today: http://www.universetoday.com/. Another commercial site, with good articles by science journalists, but a lot of ads.

Sites for answering astronomical questions

Ask an Astrobiologist: http://astrobiology.nasa.gov/ask-an-astrobiologist/. On this site from the National Astrobiology Institute at NASA, astronomer David Morrison answered questions about the search for life on other planets, the origin of life on Earth, and many other topics.

Ask an Astronomer at Lick Observatory: http://www.ucolick.org/~mountain/AAA/. Graduate students and staff members at this California observatory answered selected astronomy questions, particularly from high school students.

Ask an Astrophysicist: http://imagine.gsfc.nasa.gov/docs/ask_astro/ask_an_astronomer.html. Questions and answers at NASA’s Laboratory for High-Energy Astrophysics focus on X-ray and gamma-ray astronomy, and such objects as black holes, quasars, and supernovae.

Ask an Infrared Astronomer: http://coolcosmos.ipac.caltech.edu/cosmic_classroom/ask_astronomer/faq/index.shtml. A site from the California Institute of Technology, with an archive focusing on infrared (heat-ray) astronomy and the discoveries it makes about cool objects in the universe. No longer taking new questions.

Questions & Answers

Ayele, K., 2003. Introductory Economics, 3rd ed., Addis Ababa.
Widad Reply
can you send the book attached ?
Ariel
?
Ariel
What is economics
Widad Reply
the study of how humans make choices under conditions of scarcity
AI-Robot
U(x,y) = (x×y)1/2 find mu of x for y
Desalegn Reply
U(x,y) = (x×y)1/2 find mu of x for y
Desalegn
what is ecnomics
Jan Reply
this is the study of how the society manages it's scarce resources
Belonwu
what is macroeconomic
John Reply
macroeconomic is the branch of economics which studies actions, scale, activities and behaviour of the aggregate economy as a whole.
husaini
etc
husaini
difference between firm and industry
husaini Reply
what's the difference between a firm and an industry
Abdul
firm is the unit which transform inputs to output where as industry contain combination of firms with similar production 😅😅
Abdulraufu
Suppose the demand function that a firm faces shifted from Qd  120 3P to Qd  90  3P and the supply function has shifted from QS  20  2P to QS 10  2P . a) Find the effect of this change on price and quantity. b) Which of the changes in demand and supply is higher?
Toofiq Reply
explain standard reason why economic is a science
innocent Reply
factors influencing supply
Petrus Reply
what is economic.
Milan Reply
scares means__________________ends resources. unlimited
Jan
economics is a science that studies human behaviour as a relationship b/w ends and scares means which have alternative uses
Jan
calculate the profit maximizing for demand and supply
Zarshad Reply
Why qualify 28 supplies
Milan
what are explicit costs
Nomsa Reply
out-of-pocket costs for a firm, for example, payments for wages and salaries, rent, or materials
AI-Robot
concepts of supply in microeconomics
David Reply
economic overview notes
Amahle Reply
identify a demand and a supply curve
Salome Reply
i don't know
Parul
there's a difference
Aryan
Demand curve shows that how supply and others conditions affect on demand of a particular thing and what percent demand increase whith increase of supply of goods
Israr
Hi Sir please how do u calculate Cross elastic demand and income elastic demand?
Abari
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Source:  OpenStax, Astronomy. OpenStax CNX. Apr 12, 2017 Download for free at http://cnx.org/content/col11992/1.13
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