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from article Star

A view of the night sky from Cerro Paranal in the Atacama Desert in Chile. The bright star at top left is Sirius, the brightest star other than the Sun as seen from Earth. The bright star at right is Canopus, which happens to be the second brightest…

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from article Star

Looking toward the core of Milky Way, along a line of sight holding millions of stars in the disk of the Galaxy and obscuring dark bands of dust. (Credit: NASA)

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from article Star

The Hertzsprung-Russell (HR) diagram, which plots stars' temperatures (x axis) against their luminosities (y axis). Numerous examples of stars in the Milky Way are included in this sample diagram. (Credit: ESO)

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from article Star

An artist's impression of the sizes and appearances of a typical Sunlike star, a low-mass star, a brown dwarf, and a gas giant planet. (Credit: NASA’s Goddard Space Flight Center)

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from article Star

The Jewel Box open cluster (Kappa Crucis), which lies next to the Crux (Southern Cross) constellation. (Credit: ESO)

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from article Star

Globular cluster 47 Tucanae, one of the grandest in the Milky Way Galaxy, containing over 1 million stars, seen here by the Hubble Space Telescope. [Credit: NASA, ESA, and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration. Acknowledgment: J.…

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from article Star

Hubble Space Telescope images of the star known as V1, which U.S. astronomer Edwin Hubble (the telescope's namesake) discovered in 1923. Hubble used this Cepheid variable to show that a faint, fuzzy patch in the constellation Andromeda is actually…

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from article Star

Hubble Space Telescope image of the Ring Nebula in Lyra, a planetary nebula made of glowing ionized gas that surrounds a hot blue star. [Credit: H. Bond et al., Hubble Heritage Team (STScI /AURA), NASA]

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from article Star

A multi-wavelength view of the Crab Nebula. The pulsar at its heart appears as a white dot in this image. The image compiles observations in radio waves via the Karl G. Jansky Very Large Array (VLA), infrared light via the Spitzer Space Telescope.…

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from article Star

An artist's impression of a cutaway into an aged, high-mass star, offering a simplified depiction of its internal elemental layering. Elements are identified by their periodic table symbol. (Credit: NASA/CXC/M.Weiss)

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from article Sidereal time

Diagram of the Earth's motions, illustrating the concepts of sidereal time, hour angle, and right ascension. Symbols are explained in text.

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from article Licorice

Small cut pieces of dried licorice root (Glycyrrhiza glabra).

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from article Rape

Rape (Brassica napus). (Credit: Howard F. Schwartz)

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from article Celestial mechanics

Major bodies of the solar system, shown not to scale. The application of celestial mechanics has constrained their observed motions to an extremely high degree of precision, sufficient for plotting intercepts and flybys with spacecraft launched from…

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from article Celestial mechanics

Elliptical orbit of a satellite. (a) The orbit in a plane. (b) Orientation of the orbit in space.

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from article Celestial mechanics

Elements that are the basis of the celestial coordinate system most commonly used by astronomers.

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from article Celestial mechanics

Hohmann transfer, an interplanetary trajectory that connects two planetary orbits, enabling a spacecraft to travel from one to the other.

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from article Color index

Responses of the U, B (close to photographic), and V (close to visual) filters are superimposed onto blackbody curves for 3400, 5800, and 23,000 K (5660, 9980, and 40,940°F). The higher-temperature body is brighter in the blue and has a lower…

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from article Color index

Graph of the color index B-V versus the logarithm of the temperature T (in kelvins). As temperature climbs, the B-V color index decreases. (Courtesy of P. J. Flower, Transformations from theoretical Hertzsprung-Russell diagrams to color-magnitude…

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from article Zodiacal light

Morning zodiacal light as it typically appears at a low, northern latitude site, Mount Haleakala, Hawaii, at an altitude of 10,000 ft (3300 m). The outcropping of rock at the base of the zodiacal cone is approximately 20° from the Sun. (P. B.…

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from article Zodiacal light

All-sky photograph, taken from Mount Komagatake, Japan, showing the zodiacal band and Gegenschein, and the Milky Way.

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from article Astronomical transit instrument

Six-inch (15-cm) transit circle, U.S. Naval Observatory. (Official U. S. Naval Observatory photograph)

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from article Astronomical transit instrument

Carlsberg Meridian Circle, La Palma, Canary Islands. (University of Copenhagen)

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from article Star clouds

Hubble Space Telescope image of the center of the Sagittarius star cloud. (Hubble Heritage Team; Association of Universities for Research in Astronomy; Space Telescope Science Institute; NASA)

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from article Distilled spirits

Flow diagram of whiskey production. (J. E. Seagram and Sons)

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from article Symbiotic star

Hubble Space Telescope image of the Southern Crab Nebula, about 4400 parsecs (14,000 light-years) away. It contains a symbiotic system with a Mira-type star and a white dwarf, too close together to be visible as separate objects. The inset shows a…

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from article Symbiotic star

Hubble Space Telescope image of R Aquarii, the closest symbiotic system, about 200 parsecs (650 light-years) away. Its highly collimated bipolar jets are ejected from the central stars, which are too close together to be seen as separate objects.…

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from article Occultation

Schematic light curve of a central occultation by a ringed planet with substantial atmosphere. The relative brightness of the star, π(r), is plotted as a function of time or distance from the center of the planet, r. The decrease in stellar…

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from article Sugar crops

Sugarcane (Saccharum officinarum) growing in Cuba. (Credit: Curioso Photography/Shutterstock)

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from article Sugar crops

Sugarbeets (Beta vulgaris). (Credit: Agricultural Research Service, U.S. Department of Agriculture)

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from article Food

Sources of healthy fats, which are one component of a balanced diet. (Credit: Tina Larsson\Getty Images)

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from article Food microbiology

Pie chart showing the 14 major foodborne pathogens according to their economic costs (shown in terms of percent and U.S. dollars). The annual cost estimates are based on disease incidences in the United States. The five most costly foodborne…

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from article Food microbiology

A colorized scanning electron micrograph (SEM) of Salmonella enterica serovar Enteritidis. This foodborne pathogen can cause enteric (intestinal) infections. (Credit: Jean Guard-Petter/U.S. Department of Agriculture)

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from article Food microbiology

A digitally colorized scanning electron micrograph (SEM) depicting a number of mustard-colored, spheroid-shaped Staphylococcus aureus bacteria that were in the process of escaping their destruction by blue-colored human white blood cells. (Credit:…

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from article Food microbiology

Low-temperature electron micrograph of a cluster of E. coli bacteria. Each individual bacterium is oblong-shaped. (Credit: Eric Erbe/U.S. Department of Agriculture; digital colorization by Christopher Pooley/U.S. Department of Agriculture)

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from article Food microbiology

Confocal light micrograph of Campylobacter jejuni cells (fluorescent green) on chicken skin. (Credit: Anna Bates/U.S. Department of Agriculture)

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from article Cinnamon

Close-up view of the cinnamon plant (Cinnamomum verum). (Photograph courtesy of Jim Space, U.S. Forest Service, Pacific Island Ecosystems at Risk)

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from article Cosmic strings

Snapshots of the simulated string distribution, that is, the string network, at two different times. (a) Radiation-dominated epoch. (b) Matter-dominated era. The size of the simulation box is that of the visible universe. (C. Ringeval, after D.…

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from article Macadamia nut

Stages of the macadamia nut (Macadamia integrifolia): (left to right) green husk of the immature fruit, which surrounds the inner nut; at maturity, the husk (now brown) splits open, showing the nut; nut in its smooth shell; white kernel (nut).…

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from article 3D Skull Candy Mold

3D skull model before printing.

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from article 3D Skull Candy Mold

Fig. 1. Selected skull model file from Thingiverse. The circled icons in the bottom of the right-hand column indicate specific Creative Commons licenses associated with this file.

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from article 3D Skull Candy Mold