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

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

Aurora Australis

Apollo mission profile for a lunar landing and return, outlining the various stages along the mission.

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

Space mail

Height of space from Earth, illustration

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

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

Height of space from Earth, illustration

Height of space from Earth, illustration

Future base on the Moon, illustration

Future base on the Moon, illustration

Future city on the Moon, illustration

ISS inflatable habitat, illustration

Space man museum, conceptual illustration

Asteroid mining settlement, artwork

Height of space from Earth, illustration

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

Space station orbiting Earth, artwork

Space station and astronaut, illustration

Saturn 5 rocket, illustration

Saturn 5 rocket, illustration

Saturn 5 rocket, exploded diagram

Saturn 5 rocket, exploded diagram

Crew exploration vehicle approaching ISS, illustration

Crew exploration vehicle approaching ISS, illustration

The Apollo program: the Saturn V launch vehicle and configurations of the spacecraft modules at launch and during the journey.

Lunar tug and the ISS, artwork

Dicer with pre-miR-15a and TARBP2, illustration

Venus airship, illustration

Venus airship, illustration

Venus airship, illustration

Venus airship, illustration

Artist's impression of the Oort Cloud

Asteroid distribution

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

Cargo ship approaching the ISS, illustration

Cargo ship approaching the ISS, illustration

Theoretical diagram showing the effects of an advancing tectonic plate on other adjacent, but stationary, tectonic plates.

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.

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

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.

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

The components of a scanning electron microscope (SEM).

The components of a transmission electron microscope (TEM).

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

The diffusion of water across a semipermeable membrane.

The diffusion of potassium cations across a semipermeable membrane.

Changes in ion permeance underlying the action potential.

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

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.

Diagram of a mammalian muscle spindle.

Fission bomb designs

Thermonuclear warhead

Wormhole through hyperspace, artwork

Internal structure of Mercury, illustration

Internal structure of Mercury, illustration

Internal structure of Earth, illustration

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

Space station, illustration

Space station, illustration

Space station in Earth's orbit, illustration

U.S. space shuttle, composed of a winged orbiter, an external liquid-propellant tank, and two solid-fuel rocket boosters.

Birth of Galaxies

Soviet space program, conceptual artwork

Mars cycler spacecraft, artwork

Mars cycler spacecraft, artwork

Mars cycler spacecraft, artwork

Cross section of a V-type engine.

Skylab concept sketch

Basic components of an electrochemical cell.

Muscle structure, artwork

Coriolis force

Displacements in the Earth in four types of free vibrations.

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

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.

Solar System Structure Out to Oort Cloud

Height of space from Earth, illustration

Robot exploring alien planet, illustration

Mars Terraforming Station

Mars Terraforming Station

Electromagnetic spectrum. The visible range (shaded portion) is shown enlarged on the right.

Crew exploration vehicle docked with ISS, illustration

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

Viral transfer of bacterial DNA, artwork

Viking 1 mapping Martian surface, illustration

Space stations, illustration

Futuristic space station, illustration

Futuristic space station, illustration

Futuristic space station

Illustration of a Space Colony

Illustration of a Space Colony, illustration

Illustration of a Space Colony

Futuristic space station, illustration

Futuristic spaceships, illustration

Futuristic spaceships, illustration

Night Time on a Stanford Torus

Spacecraft, illustration

Space station, illustration

Artwork of a Space Habitat

Salyut 7 space station in orbit, 1980s

Interplanetary station, illustration

Laser Interferometer Space Antenna (LISA), a Beyond Einstein Great Observatory, is scheduled for launch in 2015

Four types of gasoline engines: opposed-piston engine, rotary engine, in-line engine, and V-type engine.

Diesel engine equipped with a precombustion chamber.

Cardiac stress test, artwork

Cumulative number of objects launched into space, graph

Earth's magnetic field, artwork

Stages in the process of meiosis, cell division among sexually reproducing organisms.

Receptor-mediated endocytosis enables cells to ingest molecules such as protein that are necessary for normal cell functioning.

Transverse section of an artery.

The stages in the evolution of a wave (frontal) cyclone.

Horizontal divergence and convergence patterns associated with the polar-front jet.

Two types of pressure gauge: the U-tube manometer and the Bourdon-tube gauge.

Diagram of a human uterus during the fourth month of pregnancy.

Cross section of a crystal microphone.

Pluto and the Kuiper belt

Dicer with pre-miR-15a and TARBP2, illustration

Electron shell

Four main types of estuaries: A) salt wedge estuary, B) partially mixed estuary, C) vertically homogeneous estuary, D) fjord.

Female reproductive system, artwork

Gender characteristics, artwork

Osteoarthritis of the knee, artwork

Protein synthesis, artwork

Gate control theory of pain, artwork

Freedom space station, artwork

Freedom space station, artwork

keyboard button with arrow sign

Dwarf planets and moons, illustration

Dwarf planets and moons, illustration

Interior of Sun

Interior of Sun

Solar system planets, illustratoin

Solar system planets, illustratoin

Artwork of the orbits of the Solar System

Asteroseismology

Moons of the eight major planets.

Moons of the eight major planets

Planets as one, illustration

Planets as one, illustration

How Uranus got its Tilt

Solar System Distances to Scale

Interior, Surface and Atmosphere of Sun

Evolution of the Big Dipper asterism

Evolution of the Big Dipper asterism

Interior, Surface and Atmosphere of Sun

Dwarf Planets and Earth Compared

Dwarf Planets and Moon Compared

Dwarf Planets Compared

Solar Granulation

Diagram of comet reservoirs

Diagram of comet reservoirs

Cutaway of a red dwarf star

Cutaway of a red dwarf star

Cutaway of a red dwarf star

Geometry of a solar and a lunar eclipse.

Geometry of a solar and a lunar eclipse.

Spiral galaxy, schematic illustration

Comparison of the Sun and Stephenson 2-18, illustration

Comparison of Sun and Stephenson 2-18, illustration

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

Evolution of the Universe, artwork

Earth and Moon space-time warp, artwork

Life-cycle of the Sun, artwork

Solar system astronomy, 19th century

Diagram showing interior of Jupiter

Diagram showing interior of Jupiter

Diagram showing interior of Jupiter

Internal structure of Earth, illustration

Diagram of an artificial pacemaker

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Spacecraft with asteroid, illustration

Spacecraft flying through asteroids

Planet in outer space, illustration

Terraformed Venus, illustration

Sputnik and the Russian hammer and sickle

Saturn 5 rocket, illustration

Saturn 5 rocket during launch, illustration

Saturn 5 rocket during launch, illustration

Saturn 5 rocket during launch, illustration

Rover and large dish on Mars, illustration

Vehicles and drones on alien planet, illustration

Terraforming units on Mars, illustration

Life on Ancient Mars