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

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

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

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

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

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

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

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

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

Pay-off matrix showing bourgeois, or mixed attack/retreat behaviour, as the most stable strategy for a population.

Aurora Australis

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

Saturn 5 rocket, illustration

Saturn 5 rocket, illustration

Saturn 5 rocket, exploded diagram

Saturn 5 rocket, exploded diagram

Solar cells, whether used in a central power station, a satellite, or a calculator, have the same basic structure.

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

Basic components of an electrochemical cell.

Coriolis force

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

Rising air in an unstable atmosphere

Electron shell

Schematic drawing of the structure of a typical bacterial cell of the bacillus type.

Vegetation profile of a temperate deciduous forest.

Cross section of a typical bomb calorimeter.

The process of cell division by mitosis.

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.

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

Transverse section of an artery.

Human arterial supply and venous drainage of the organs.

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

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

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

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

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

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

Diagram of a two-cavity klystron, used as an amplifier and RF signal source at microwave frequencies, and also as an oscillator.

Elements of a magnetron, used to generate power for radar systems, microwave ovens, plasma screens, and linear accelerators.

Elements of the traveling-wave tube (TWT), used to amplify microwave signals over broad bandwidths.

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

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

Blower-scavenged, two-stroke-cycle engine with uniflow scavenging, displaying both upstroke and downstroke.

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

A tokamak is a toroidal magnetic confinement system used as a method of achieving fusion energy.

Cross section of a V-type engine.

Diesel engine equipped with a precombustion chamber.

Georges Leclanche's dry cell and its later variations, zinc chloride and alkaline cells, are batteries commonly used worldwide.

Modern version of the Leclanche cell. This heavy-duty zinc-carbon primary battery is a dry cell with an immobilized electrolyte.

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 Hardy-Weinberg Law applied to two alleles.

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

The diffusion of water across a semipermeable membrane.

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

Height of space from Earth, illustration

Asteroid distribution

Height of space from Earth, illustration

Earth's prebiotic and modern atmosphere

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

Diagram of an artificial pacemaker

Internal structure of Mercury, illustration

Internal structure of Mercury, illustration

Internal structure of Earth, illustration

Wormhole through hyperspace, artwork

Vegetation profile of a desert.

Vegetation profile of tropical mountain lands.

The analysis of sound frequencies by the basilar membrane.

Diagram of a mammalian muscle spindle.

Bohr atomic model

Annual circulation patterns in a dimictic lake: stratification in the summer and complete overturn in the autumn and spring.

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

The components of a scanning electron microscope (SEM).

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.

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

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.

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

Fission bomb designs

Thermonuclear warhead

矢印　循環　輪

矢印　循環　輪

矢印　循環　輪

Displacements in the Earth in four types of free vibrations.

Height of space from Earth, illustration

Height of space from Earth, illustration

Compton effect

Zonation of the ocean. Note that in the littoral zone the water is at the high-tide mark.

Vegetation profile of a grassland.

The gasoline carburetor is a device that introduces fuel into the airstream as it flows into the engine.

The sequence of events in a four-stroke diesel engine involves a single intake valve, fuel-injection nozzle, and exhaust valve.

Cutaway view of a typical construction of a miniature power cell, as in a zinc-silver oxide or zinc-mercuric oxide system.

A fuel cell (actually a group of cells) has essentially the same kinds of components as a battery.

A grid-connected solar cell system.

Types of faulting in tectonic earthquakes.

Polar covalent bond

Vegetation profile of a boreal forest. The tree layer consists mainly of conifers, and mosses are the predominant ground cover.

The weather model of meteorologist Edward Lorenz.

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.

Viking 1 mapping Martian surface, illustration

Birth of Galaxies

Pluto and the Kuiper belt

The first reduction for an n-person voting game theory, illustrating the strategies least suitable for each participant.

Venus airship, illustration

Venus airship, illustration

Venus airship, illustration

Venus airship, illustration

Gender characteristics, artwork

Jupiter's atmosphere

The two sensory organs of balance: the cristae of the semicircular ducts and the maculae of the utricle and saccule.

A cutaway view shows how light passes through the lenses and prisms of binoculars.

Diagram showing a healthy heart valve compared with a diseased heart valve and an artificial heart valve.

Comparison of a normal heart to one with a ventricular septal defect

Diagram demonstrating the difference between a normal heart and a heart with an atrial septal defect

Annual temperature and precipitation patterns for several locations with different climatic conditions.

The surface reflectance differences between a pre-agricultural (forest) and a modern agricultural (patchwork heating) landscape.

Gyrotron, electrons from the cathode acquire cyclotron rotation in the cavity.

The four strokes of a four-stroke cycle engine - intake, compression, power, and exhaust. Only the intake stroke delivers power.

An electron (e) in a solar cell interacting with light and dissipating excess energy is analogous to a child playing on a slide.

Nickel (hydroxide)-cadmium cell of “jelly roll” construction. This rechargable battery is commonly used in portable devices.

Cutaway view of an alkaline-manganese dioxide power cell.

An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust.

Typical gasoline engine cooling system.

Typical gasoline engine lubrication system.

Proton exchange membrane (PEM) fuel cell.

Generated by an undersea earthquake, a tsunami may propagate over open ocean waters before cresting and inundating a coastline.

A heart-lung machine diverts blood from the body to an oxygenator, which removes CO2, adds O2, and returns the blood to the body

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

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.

Cardiac stress test, artwork

Electrical conduction in the heart in healthy individuals is controlled by pacemaker cells in the sinoatrial node.

Pie chart with "W' sign

Pluto and Charon Compared to Earth

Space mail

Triton hopper concept spacecraft, illustration

Moon interior

Venus's middle and lower atmosphere

Pluto-Charon mutual eclipses

Near-Earth objects

Uranus's orbit

Artist's impression of the Oort Cloud

Cross section of a crystal microphone.

Mars, illustration

Pluto, illustration

Artwork of the orbits of the Solar System

keyboard button with arrow sign

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

The relationship between hot springs and epithermal veins.

Weathering frees heavy minerals from their matrix, washing them down slope where flowing water forms them into placer deposits.

When monochromatic light passes through two narrow slits to illuminate a screen, it creates a pattern of bright and dark bands.

When monochromatic light passing through a single slit illuminates a screen, a characteristic diffraction pattern is observed.

Female reproductive system, artwork

Muscle structure, artwork

Osteoarthritis of the knee, artwork

Protein synthesis, artwork

Gate control theory of pain, artwork

Van Allen radiation belt

Solar system astronomy, 19th century

Astronomical clock, 19th century

Venera 4 lander and service craft, illustration

Venera 4 lander, illustration

Cross section comparing the left ventricular wall of normal heart to a left ventricular wall that has experienced hypertrophy.

Earth's magnetic field, artwork

Viral transfer of bacterial DNA, artwork

グローバルイメージ

ExoMars Trace Gas Orbiter, artwork

Pythagorean theorem, illustration

Ionic bond

Diagram showing interior of Jupiter

Diagram showing interior of Jupiter

Diagram showing interior of Jupiter

Internal structure of Mercury, illustration

Internal structure of Earth, illustration

Internal structure of Earth, illustration

Wormhole through hyperspace, artwork

Moons of the eight major planets.

Moons of the eight major planets

Drone in desert, illustration

Spacecraft landing on planet

Planet in outer space, illustration

Terraformed Venus, illustration

Future base on the Moon, illustration

Future base on the Moon, illustration

Future city on the Moon, illustration

Life on Ancient Mars

Life on Ancient Mars

Life on Ancient Mars

New Horizons encounters 2014 MU69, illustration

Voyager 1 passes into interstellar space

Voyager 1 passes into interstellar space

Mars covered in water, artwork

Asteroid mining settlement, artwork

Jupiter, illustration

Jupiter, illustration