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Artist's impression of the Oort Cloud

Solar System Structure Out to Oort Cloud

Artwork of the orbits of the Solar System

Diagram of comet reservoirs

Diagram of comet reservoirs

Internal structure of Earth, illustration

Moons of the eight major planets.

Moons of the eight major planets

Solar System Distances to Scale

Geometry of a solar and a lunar eclipse.

Geometry of a solar and a lunar eclipse.

Diagram showing interior of Jupiter

Diagram showing interior of Jupiter

Diagram showing interior of Jupiter

In Ptolemy's geocentric model of the universe, the Sun, Moon, and each planet orbit a stationary Earth.

Asteroid distribution

Internal structure of Mercury, illustration

Internal structure of Mercury, illustration

Internal structure of Mercury, illustration

Internal structure of Earth, illustration

Internal structure of Earth, illustration

Satellite orbit altitudes, illustration

Birth of Galaxies

Diagram of the Asteroid Belt

Diagram of the Asteroid Belt

Solar Granulation

Comet passing by the Earth, illustration

Edge of the Oort Cloud, illustration

Aurora Australis

Orbits of near-Earth asteroids

Orbits of near-Earth asteroids

Interior of Sun

Interior of Sun

Asteroseismology

Voyager probe in the Oort cloud, illustration

Dwarf planets and moons, illustration

Dwarf planets and moons, illustration

Solar system planets, illustratoin

Solar system planets, illustratoin

Planets as one, illustration

Planets as one, illustration

How Uranus got its Tilt

Dwarf Planets and Earth Compared

Dwarf Planets and Moon Compared

Dwarf Planets Compared

Scale of Solar System Bodies

Scale of Solar System Bodies

Scale of Solar System Bodies

Scale of Solar System Bodies

Scale of Solar System Bodies

Map of the Solar System

Jupiter's atmosphere

Seismic ray types in Earth's interior from earthquake at F.

Automotive-type lead-acid battery, a storage battery that holds its charge for a long time and can be recharged.

Diagram of a mammalian muscle spindle.

U.S. space station Skylab (occupied 1973-74), shown with docked Apollo Command and Service modules.

Evolution of the Universe, artwork

Earth and Moon space-time warp, artwork

Life-cycle of the Sun, artwork

Solar system astronomy, 19th century

Space station Mir, after its completion in 1996, with the launch dates of each modular component shown.

Impression of Hottest Known Planet

Impression of Hottest Known Planet

America compared with Valles Marineris, illustration

Cross section of a crystal microphone.

Pluto and the Kuiper belt

Solar System Compared to North America

Solar System Compared to North America

Solar System Compared to North America

Oort cloud, illustration

Oort cloud objects, illustration

Sun and terrestrial planets, illustration

Galaxy collision and merger, illustration

Birth and Death of the Solar System

Birth and Death of the Solar System

Birth and Death of the Solar System

Dwarf Planets and Moons Compared

Solar Life Cycle

Diagram of Great American Eclipse, 2017

Diagram of Great American Eclipse, 2017

Diagram of Great American Eclipse, 2017

Diagram of Great American Eclipse, 2017

Cutaway of a red dwarf star

Cutaway of a red dwarf star

Cutaway of a red dwarf star

The components of a scanning electron microscope (SEM).

Diagram depicting the process of atoll formation. Atolls are formed from the remnant parts of sinking volcanic islands.

Moon interior

Speedometer

Spring balance

Fission bomb designs

Thermonuclear warhead

The journey of the Galileo spacecraft to Jupiter, highlighting major observations along the trajectory, as well as their dates.

Kuiper belt and Oort cloud, illustration

Oort Cloud formation and evolution, illustration

Kuiper belt and Oort cloud, illustration

Diagram showing the Lunar tides

Diagram of Earth's orbit around the Sun

Height of space from Earth, illustration

The process of cell division by mitosis.

Average exchange of energy between the surface, atmosphere, and space, as percentages of incident solar radiation.

General patterns of atmospheric circulation over an idealized Earth with a uniform surface and the actual Earth.

The weather model of meteorologist Edward Lorenz.

The Michelson interferometer measures the effect on the speed of light of the motion of the ether through which light travels.

Relationships of endocrine glands, from the pituitary-hypothalamus system to the vertebrate endocrine glands and their hormones.

Phylogeny based on differences in the protein sequence of cytochrome c in organisms ranging from Neurospora mold to humans.

Three types of natural selection, showing the effects of each on the distribution of phenotypes within a population.

Evolutionary history of the globin genes. The dots indicate the duplication of ancestral genes, giving rise to new gene lineage.

The steps involved in the engineering of a recombinant DNA molecule.

Light waves matching the orientation of the molecules of a polarizing filter are absorbed, reducing the intensity of the light.

The artery wall and the ultrastructure of the smooth muscle cells within it.

The diffusion of water across a semipermeable membrane.

White dwarf planet, illustration

Algol Eclipses

The endoplasmic reticulum plays an important role in the biosynthesis, processing, and transport of proteins and lipids.

Interior of the Sun, illustration

Interior of the Sun, illustration

Interior of the Sun, illustration

Orbits of planets in the Solar System, illustration

Sungrazing comet, illustration

Sungrazing comet, illustration

Solar System, illustration

Solar System, illustration

Structure of Planetary Rings

Solar Life Cycle

Diagram showing the Milankovitch cycles

Interior, Surface and Atmosphere of Sun

Interior, Surface and Atmosphere of Sun

Heart conduction system, artwork

Evolution of the Big Dipper asterism

Evolution of the Big Dipper asterism

Solar system distances, illustration

Comet Bernardinelli窶釘ernstein, illustration

Solar System, illustration

Evolution of Mercury Interior

Diagram of Earth's orbit around the Sun

Blood alcohol concentration

Blood alcohol concentration

Uniformly accelerated motion; s = speed, a = acceleration, t = time, and v = velocity.

The mechanical components of a compound microscope.

Image formation in a microscope, according to the Abbe theory.

The components of a transmission electron microscope (TEM).

The diffusion of potassium cations across a semipermeable membrane.

Changes in ion permeance underlying the action potential.

A cross section of Earth's outer layers, from the crust through the lower mantle.

The age of Earth's oceanic crust, as measured in millions of years.

Approaching the speed of light, an object appears shorter, with a longer time interval, relative to its intervals when at rest.

The 4-D space-time continuum is distorted in the vicinity of any mass, depending on the mass and the distance from the mass.

Differentiation of the external genitalia in the human embryo and fetus.

Venus's middle and lower atmosphere

Pluto-Charon mutual eclipses

Near-Earth objects

Uranus's orbit

Nuclear blast and radiation effects

Valley and mountain breezes

Pluto and Charon Compared to Earth

Theoretical depiction of the movement of tectonic plates across Earth's surface.

Diagram showing the Lunar tides

Diagram showing the Lunar tides

Diagram showing the Lunar tides

Saturn 5 rocket, illustration

Saturn 5 rocket, illustration

Saturn 5 rocket, exploded diagram

Saturn 5 rocket, exploded diagram

Basic characteristics of orbits in which a satellite can be placed around Earth, categorized by inclination, shape and altitude.

Height of space from Earth, illustration

Basic components of an electrochemical cell.

Diagram showing interior of Mars

Diagram showing interior of Mars

Diagram showing interior of Mars

Human arterial supply and venous drainage of the organs.

Diagram of a wave system depicting typical divergence and convergence distributions for non-tilting and tilting systems.

The onset and retreat of the West African monsoon with respect to the timing of the direct rays of the sun.

Atomic structure, illustration

Meteors on Mars, illustration

Solar System, illustration

Solar System, illustration

Comet Kohoutek orbital path, illustration

Solar System orbits, illustration

Solar System orbits, illustration

Solar System orbits, illustration

Solar System planets and orbits, illustration

Solar System planets and orbits, illustration

Solar system planets

2060 Chiron and Saturn, illustration

Binary asteroid 288P, illustration

Comet and minor planet types and orbits, illustration

Solar System and comet, illustration

Solar System and comet, illustration

Solar System and comet, illustration

Stages of a comet's orbit, illustration

Leonhard Euler's diagram of the solar system

Cross section of a V-type engine.

The relationship between hot springs and epithermal veins.

Illustration of the heliosphere

Illustration of the heliosphere

Satellite above a planet

Seasons change because more direct sunlight falls on some parts of Earth than others at different times of the year.

Illustration of a Space Colony

Illustration of a Space Colony, illustration