science

National Virtual Observatory

National Virtual Observatory is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand National Virtual Observatory rather than just read about it. In short: The US National Virtual Observatory'-NVO- (nowadays VAO - Virtual Astronomical Observatory) was conceived to allow scientists to access data from multiple astronomical observatories, including ground and space-based facilities, through a single portal. Originally, the National Science Foundation (NSF) funded the information technology research that created the basic NVO infrastructure through a multi-organization co…

Key takeaways

National Virtual Observatory belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect National Virtual Observatory to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of National Virtual Observatory from memory before moving on to harder problems.

Reference excerpt

The US National Virtual Observatory'-NVO- (nowadays VAO - Virtual Astronomical Observatory) was conceived to allow scientists to access data from multiple astronomical observatories, including ground and space-based facilities, through a single portal. Originally, the National Science Foundation (NSF) funded the information technology research that created the basic NVO infrastructure through a multi-organization collaborative effort. The NVO was more than a “digital library”; it was a vibrant, growing online research facility akin to a bricks-and-mortar observatory for professional astronomers. As of October 1, 2014, funding ceased for the National Virtual Observatory (NVO) and all code and digital assets of the project were made publicly available at the VAO Closeout Repository.

Concept The NVO was conceived to allow scientists to grapple with the enormous growth in astronomical data resulting from significant advances in telescope, detector, and computer technologies. These advances have resulted in a plethora of images, other data, and catalogs. In August 2001, the NSF allocated funding for a proposal entitled "Framework for the National Virtual Observatory". The grant was approved under its Information Technology Research program (since superseded). NVO funding supported collaboration to produce a distributed computing framework for an integrated cyber infrastructure for astronomers providing seamless access to these astronomical resources. The manifestation of this infrastructure was an operational “virtual observatory” available to scientists and to the public. Investigators acquired existing astronomical data from a variety of observatory archives through “virtual instruments”, that is, computer interfaces, tools, and services. The NVO was planned and implemented in synergy with the research community, the primary users of the system. In 2007, the operational stage of the NVO began with combined funding from NSF and NASA and programmatically executed through NSF. Scientists originally accessed the NVO through the NVO website.

Data Data in the NVO Closeout Repository are available from a variety of observatories and wavelengths, including NSF's National Optical Astronomy Observatory (NOAO), National Radio Astronomy Observatory (NRAO), the Sloan Digital Sky Survey (SDSS), and the 2 Micron All Sky Survey (2MASS). Also found in the NVO are NASA's rich data collections including data from the Hubble Space Telescope, the Chandra X-ray Observatory, the Spitzer Space Telescope, and other space-based missions. The NVO Closeout Repository provides access to a variety of additional data from nearly every astronomical research facility, observatory, and telescope across the globe.

Collaboration The NVO development project was distributed across many institutions and includes teams at the Johns Hopkins University, California Institute of Technology, Space Telescope Science Institute, NOAO, Infrared Processing and Analysis Center, San Diego Supercomputer Center, and the Associated Universities, Inc. Affiliate organizations with participating teams include Goddard Space Flight Center, Carnegie Mellon University, University of Pittsburgh, National Center for Supercomputing Applications, Smithsonian Astrophysical Observatory, University of Southern California, Fermilab, United States Naval Observatory, the University of Wisconsin–Madison, and National Radio Astronomy Observatory. The NVO, a US effort, had affiliates throughout the international astronomical community including IVOA, AstroGrid (UK), Euro-VO, the Japanese VO, the Australian VO, VO India and ten other national programs.

Public Access Along with its objective to serve the scientific community by enabling research through distributed data sources and services, the NVO served the public through educational and outreach resources on the Virtual Observatory website. The modest NVO Education and Public Outreach (EPO) effort was coordinated from Space Telescope Science Institute. The NVO provided technical support for the development of educational modules integrated into partner programs. NVO EPO coordinated activities with the international communities as well.

Worked examples

Example 1 — a first encounter with National Virtual Observatory

Start with the simplest possible case. Write down what National Virtual Observatory claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to National Virtual Observatory before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about National Virtual Observatory ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of National Virtual Observatory

In research: National Virtual Observatory appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses National Virtual Observatory in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: National Virtual Observatory is common in secondary-school and first-year university syllabi. It links to neighbouring topics Science education in the United States, Virtual observatories, so understanding it makes those chapters shorter.
In everyday life: Look for National Virtual Observatory outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study National Virtual Observatory in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what National Virtual Observatory means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain National Virtual Observatory out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is National Virtual Observatory in simple terms?

Why does National Virtual Observatory matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study National Virtual Observatory?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on National Virtual Observatory.