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The World at Night: http://www.twanight.org/newTWAN/index.asp. Dramatic night-sky images by professional photographers who are amateur astronomers. Note that while many of the astronomy sites allow free use of their images, these are copyrighted by photographers who make their living selling them.

Other useful general galleries

Anglo-Australian Observatory: http://203.15.109.22/images/. Soon at https://www.aao.gov.au/public/images. Great copyrighted color images by leading astro-photographer David Malin and others.

Canada-France-Hawaii Telescope: http://www.cfht.hawaii.edu/HawaiianStarlight/images.html. Remarkable color images from a major telescope on top of the Mauna Kea peak in Hawaii.

European Space Agency Gallery: http://www.esa.int/spaceinimages/Images. Access images from such missions as Mars Express, Rosetta, and Herschel.

Gemini Observatory Images: http://www.gemini.edu/index.php?option=com_gallery. Images from a pair of large telescopes in the northern and the southern hemispheres.

Isaac Newton Group of Telescopes Image Gallery: http://www.ing.iac.es/PR/images_index.html. Beautiful images from the Herschel, Newton, and Kapteyn telescopes on La Palma.

National Radio Astronomy Observatory Image Gallery: http://images.nrao.edu/. Organized by topic, the images show objects and processes that give off radio waves.

Our Infrared World Gallery: http://coolcosmos.ipac.caltech.edu/image_galleries/missions_gallery.html. Images from a variety of infrared astronomy telescopes and missions. See also their “Cool Cosmos” site for the public: http://coolcosmos.ipac.caltech.edu/.

Some galleries on specific subjects

Astronaut Photography of Earth: http://eol.jsc.nasa.gov/.

Chandra X-Ray Observatory Images: http://chandra.harvard.edu/photo/category.html.

NASA Human Spaceflight Gallery: https://www.flickr.com/photos/nasa2explore or http://spaceflight1.nasa.gov/gallery/index.html. Astronaut images.

Robert Gendler: http://www.robgendlerastropics.com/. One of the amateur astro-photographers who comes closest to being professional.

Sloan Digital Sky Survey Images: http://www.sdss.org/gallery/.

Solar Dynamics Observatory Gallery: http://sdo.gsfc.nasa.gov/gallery/main. Sun images.

Spitzer Infrared Telescope Images: http://www.spitzer.caltech.edu/images.

Astronomy apps for smartphones and tablets

A pretty comprehensive listing of such apps with brief descriptions and links to their websites can be found at: http://dx.doi.org/10.3847/AER2011036. The list is now a few years old, but most of the apps are still available.

Listings and reviews of apps

11 Best Astronomy Apps for Amateur Star Gazers: http://www.businessinsider.com/11-best-astronomy-apps-for-amateurs-2013-10. From Kelly Dickerson (2013).

14 Best Astronomy Apps for Stargazers and Space Lovers: http://nerdsmagazine.com/best-astronomy-apps-for-android/. Viney Dhiman’s recommendations, part of Nerd’s Magazine (2014).

15 Best Astronomy Applications for iPhone: http://www.iphoneness.com/iphone-apps/top-astronomy-applications-for-iphone/. From iPhoneness.

Apps for Stargazing: http://appadvice.com/appguides/show/astronomy-apps. App Advice site’s reviews.

NASA Apps for Smartphones and Tablets: https://www.nasa.gov/connect/apps.html.

Phone/Tablet Apps and the Practical Astronomer: http://www.cloudynights.com/page/articles/cat/user-reviews/phonetablet-apps-and-the-practical-astronomer-r2925. Active amateur astronomer Tom Fowler reviews 22 apps (2014).

Sky&Telescope Mobile Apps: http://www.skyandtelescope.com/sky-and-stargazing-apps/. Apps from Sky&Telescope Magazine.

Smartphone Apps Can Make Astronomy as Easy as Point and Gaze: http://www.heraldnet.com/article/20140511/LIVING/140519988.” Mike Lynch for HeraldNet (2014).

Questions & Answers

which planet orbits the closest?
Alastair Reply
What is the angle between Earth's equator and the Celestial equator? In the drawing they seem pretty similar. Thank you for this study resource.
Chuck Reply
Describe the spectrum of each of the following: starlight reflected by dust, a star behind invisible interstellar gas, and an emission nebula
shakila Reply
If the Oort cloud contains 1012 comets, and ten new comets are discovered coming close to the Sun each year, what percentage of the comets have been “used up” since the beginning of the solar system?
Day Reply
what is spectral type of sun
Akshat Reply
what everyone asking here? and who answers for them?
Shashi Reply
highest frequency wavelengh
Kathy Reply
may I know which Kingdom shows largest diversity
Arpita Reply
or students should post tough likely questions
Adepitan Reply
for example questions on demand functions and etc
Adepitan Reply
are there no ways we can get tough questions to answer
Adepitan Reply
What do you mean?
Amman Reply
excellent book bro.... keep it up.... if I find any query i will ask u.... thanks
rao Reply
Hi! I'm a bit confused, what is this
Sizakele Reply
They hsve new set of questions every time they test us. i do revision with the tutorials they give us answer extra questions from their moodle site but every time i write exams there will be few not even 10% of the questions are they. most of the time i guess. They give us three lectures who do not
Phumza Reply

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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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