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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

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
what is inflammation
Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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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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