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"The proton–proton chain reaction is one of several fusion reactions by which stars convert hydrogen to helium, the primary alternative being the CNO cycle. The proton–proton chain dominates in stars the size of the Sun or smaller.
In general, proton–proton fusion can occur only if the temperature (i.e. kinetic energy) of the protons is high enough to overcome their mutual electrostatic or Coulomb repulsion.
In the Sun, deuterium-producing events are so rare (diprotons, the much more common result of nuclear reactions within the star, immediately decay back into two protons) that a complete conversion of the star's hydrogen would take more than 1010 (ten billion) years at the prevailing conditions of its core. The fact that the Sun is still shining is due to the slow nature of this reaction; if it went more quickly, the Sun would have exhausted its hydrogen long ago." [Proton–proton chain reaction. Wikipedia]
The nuclear reaction diagram example "Proton-proton chain reaction" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Physics solution from the Science and Education area of ConceptDraw Solution Park.
Proton-proton chain reaction diagram
Proton-proton chain reaction diagram, positron, gamma particle, electron neutrino,

Sun Solar System

ConceptDraw PRO diagramming and vector drawing software offers the Astronomy solution with useful tools for drawing all kinds of astronomy pictures and sun solar system illustrations.
The astronomy illustrations designed with ConceptDraw PRO are vector graphic documents and are available for reviewing, modifying, converting to a variety of formats (image, HTML, PDF file, MS PowerPoint Presentation, Adobe Flash or MS Visio XML), printing and send via e-mail in one moment.

Astronomy Symbols

Are you an astronomer, astronomy teacher or student? And you need to draw astronomy pictures quick and easy? ConceptDraw PRO diagramming and vector drawing software extended with Astronomy solution from the Science and Education area will help you!
Astronomy solution provides 7 libraries with wide variety of predesigned vector objects of astronomy symbols, celestial bodies, solar system symbols, constellations, etc.

Cisco LAN. Cisco icons, shapes, stencils and symbols

The ConceptDraw vector stencils library Cisco LAN contains symbols for drawing the computer local area network diagrams.
This DFD sample was created on the base of the figure from the NASA website. [ ATBD/ DFD.html]
"Clouds and the Earth's Radiant Energy System (CERES).
EOS-Terra: Understanding Earth's Clouds and Climate.
The Clouds and the Earth's Radiant Energy System (CERES) instrument is one of several that will be flown aboard the Earth Observing System's Terra spacecraft, scheduled for launch in late1999. The data from the CERES instrument will be used to study the energy exchanged between the Sun; the Earth's atmosphere, surface and clouds; and outer space.
The CERES EOS-Terra instrument will be the second CERES instrument in Earth orbit. The first CERES instrument is currently orbiting the Earth aboard the Tropical Rainfall Measuring Mission observatory, which was launched in November 1997. Early results of the TRMM mission show that the first CERES has provided better measurement capabilities than any previous satellite instrument of its kind.
What CERES Will Measure.
CERES will measure the energy at the top of the atmosphere, as well as estimate energy levels in the atmosphere and at the Earth's surface. Using information from very high resolution cloud imaging instruments on the same spacecraft, CERES also will determine cloud properties, including cloud amount, altitude, thickness, and the size of the cloud particles. All of these measurements are critical for advancing our understanding of the Earth's total climate system and further improving climate prediction models.
The CERES instrument is based on NASA Langley's highly successful Earth Radiation Budget Experiment (ERBE) which used three satellites to provide global energy budget measurements from 1984 to 1990." [ centers/ langley/ news/ factsheets/ CERES.html]
The DFD example "CERES data flow diagram" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Data Flow Diagrams solution from the Software Development area of ConceptDraw Solution Park.
DFD, process, external interactor,

Sketching Software

ConceptDraw PRO is a powerful diagramming, vector drawing and sketching software that can be successfully used for creating various sketches, illustrations, drawing in any field of science and life activity. In particular, ConceptDraw PRO offers the Astronomy solution from the Science and Education area to help you design the astronomy pictures, sun solar system drawings, constellation chart quick and easy.

Time - Design Elements

Many of us want to be able to create designs efficiently yet quickly. ConceptDraw PRO will help you to make awesome drawings without having to design all those Time Elements. These elements include graphs, symbols, cliparts, visual data representation and a whole lot of other stuff.

Solar System Symbols

Astronomy solution provides the Stars and Planets library with wide variety of solar system symbols. You can find here vector objects of solar system, of stars and planets of the universe.
To quickly draw any astronomy illustration: create new document and simply drag the needed solar system symbols from the Stars and Planets library, arrange them and add the text. You can also use the predesigned templates and samples from the ConceptDraw Solution Browser as the base for your own sun solar system illustrations, astronomy and astrology drawings.
The vector stencils library "Cisco LAN" contains 23 symbols of local area network (LAN) devices and equipment for drawing Cisco LAN topology diagrams.
"Network topology describes the layout of interconnections between devices and network segments. At the Data Link Layer and Physical Layer, a wide variety of LAN topologies have been used, including ring, bus, mesh and star, but the most common LAN topology in use today is switched Ethernet. At the higher layers, the Internet Protocol (TCP/ IP) has become the standard, replacing NetBEUI, IPX/ SPX, AppleTalk and others.
Simple LANs generally consist of one or more switches. A switch can be connected to a router, cable modem, or ADSL modem for Internet access. Complex LANs are characterized by their use of redundant links with switches using the spanning tree protocol to prevent loops, their ability to manage differing traffic types via quality of service (QoS), and to segregate traffic with VLANs. A LAN can include a wide variety of network devices such as switches, firewalls, routers, load balancers, and sensors.
LANs can maintain connections with other LANs via leased lines, leased services, or the Internet using virtual private network technologies. Depending on how the connections are established and secured in a LAN, and the distance involved, a LAN may also be classified as a metropolitan area network (MAN) or a wide area network (WAN)." [Local area network. Wikipedia]
The symbols example "Cisco LAN - Vector stencils library" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Cisco Network Diagrams solution from the Computer and Networks area of ConceptDraw Solution Park. solution-park/ computer-networks-cisco
Sun workstation
Sun workstation, Sun workstation ,
Workstation, workstation,
Macintosh, Macintosh,
Terminal, terminal,
Mini VAX
Mini VAX, mini VAX, VAX, VSM, DECnet,
Printer, printer,
Laptop, laptop,
File server
File server, file server, application server,
Monitor, monitor,
Web cluster
Web cluster, Web cluster,
ATM fast gigabit etherswitch
ATM fast gigabit etherswitch, ATM fast gigabit etherswitch,
HP Mini
HP Mini, HP Mini,
Supercomputer, supercomputer,
Web server
Web server, Web server, www server,
Web browser
Web browser, Web browser,
Repeater, repeater,
General appliance
General appliance, general appliance, intelligence engine 2100 series,
PC, blue
PC, blue, PC,
Mini VAX, blue
Mini VAX, blue, mini VAX, VAX, VSM, DECnet,
This astronomic diagram example was redesigned from the Wikimedia Commons file: Extragalactic distance ladder.JPG.
[ wiki/ File:Extragalactic_ distance_ ladder.JPG]
Red boxes: Technique applicable to star-forming galaxies.
Green boxes: Technique applicable to Population II galaxies.
Cyan boxes: Geometric distance technique.
Pink box: The planetary nebula luminosity function technique is applicable to all populations of the Virgo Supercluster.
Solid lines: Well calibrated ladder step.
Dashed lines: Uncertain calibration ladder step.
"The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are "close enough" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances with methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.
The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung." [Cosmic distance ladder. Wikipedia]
The astronomy diagram sample "Extragalactic distance ladder" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Astronomy solution from the Science and Education area of ConceptDraw Solution Park.
Cosmic distance ladder
Cosmic distance ladder, Sun,

Physics Symbols

ConceptDraw PRO diagramming and vector drawing software extended with Physics solution from the Science and Education area is a powerful software for creating various physics diagrams.
Physics solution provides all tools that you can need for physics diagrams designing. It includes 3 libraries with predesigned vector physics symbols: Optics Library, Mechanics Library and Nuclear Physics Library.

Mathematics Symbols

ConceptDraw PRO extended with Mathematics solution from the Science and Education area is a powerful diagramming and vector drawing software that offers all needed tools for mathematical diagrams designing.
Mathematics solution provides 3 libraries with predesigned vector mathematics symbols and figures:
Solid Geometry Library, Plane Geometry Library and Trigonometric Functions Library.

Geo Map - Asia - Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south.
The vector stencils library Japan contains contours for ConceptDraw PRO diagramming and vector drawing software. This library is contained in the Continent Maps solution from Maps area of ConceptDraw Solution Park.

Illustration Software

No science can't exist without illustrations, and especially astronomy! Illustrations help to visualize knowledge, natural phenomenons which are studied by astronomy, they equally effective help in work, during the learning process and on the conferences.
Now we have professional astronomy illustration software - ConceptDraw PRO illustration and sketching software with templates, samples and libraries of a variety of astronomy symbols, including constellations, galaxies, stars, and planet vector shapes; a whole host of celestial bodies. When drawing scientific and educational astronomy illustrations, astronomy pictures and diagrams, can help you reach for the stars!
This vector stencils library contains 30 clipart images and astronomical symbols of sun and stars, solar system planets and moon.
Use these shapes for drawing your astronomical diagrams and illustrations.
Solar system
Solar system, Solar system,
Sun, Sun,
Mercury, Mercury,
Venus, Venus,
Earth, Earth,
Moon, Moon,
Mars, Mars,
Jupiter, Jupiter,
Saturn, Saturn,
Uranus, Uranus,
Neptune, Neptune,
Pluto, Pluto,
Red giant
Red giant , red giant,
Yellow giant
Yellow giant , yellow giant,
Blue giant
Blue giant, blue giant,
Red dwarf
Red dwarf , red dwarf,
White dwarf
White dwarf, white dwarf,
Black hole
Black hole,
Planets to scale
Planets to scale, planets,
Sun symbol
Sun symbol, Sun symbol,
Mercury symbol
Mercury symbol, Mercury symbol,
Venus symbol
Venus symbol, Venus symbol,
Earth symbol
Earth symbol, Earth symbol,
Moon symbol
Moon symbol, Moon symbol,
Mars symbol
Mars symbol, Mars symbol,
Jupiter symbol
Jupiter symbol, Jupiter symbol,
Saturn symbol
Saturn symbol, Saturn symbol,
Neptune symbol
Neptune symbol, Neptune symbol,
Uranus symbol
Uranus symbol, Uranus symbol,
Pluto symbol
Pluto symbol, Pluto symbol,