| S-band high-gain antenna | Mars - Viking 2 Lander Looking South Of Spacecraft And Utopia Planitia |
| Sahara Desert | The Earth - The Sahara Desert In Western Algeria |
| | The Earth - The Central Sahara Desert In Africa |
| Salton Sea | The Earth - California And Arizona (Imperial Valley) |
| Sam Rayburn reservoir | The Earth - Houston And The Gulf Coast Of Texas And Louisiana |
| San Andreas fault | The Earth - California And Arizona (Imperial Valley) |
| Sandy Flats | Mars - Trenches Dug By The Viking 1 Lander In The "Sandy Flats" Location |
| Sapas Mons | Venus - Sapas Mons Volcano |
| | Venus - Sapas Mons Volcano (False Color Image) |
| Saskia | Venus - 3-D Perspective View Of The"Crater Farm" |
| satellite | Mars' Satellite Deimos From 1,400 Km |
| | Mars' Satellite Deimos - Craters And Streaks |
| | Mars' Satellite Phobos By Viking 1 |
| | Mars' Satellite Phobos And Stickney Crater From 1600 Km |
| | Mars' Satellite Phobos |
| | Jupiter - As Seen By Voyager 1 |
| | Jupiter - As Seen By Voyager 2 |
| | Jupiter - The Galilean Satellites |
| | Jupiter's Satellite Io |
| | Jupiter's Satellite Io - Volcanic Caldera |
| | Jupiter's Satellite Io - Close Up |
| | Jupiter's Satellite Amalthea |
| | Jupiter's Satellite Callisto |
| | Jupiter's Satellite Callisto - Close Up |
| | Jupiter's Satellite Europa - By Galileo Spacecraft |
| | Jupiter's Satellite Europa - False Color Image Of Surface Features |
| | Jupiter's Satellite Europa - Two Views Of The Trailing Hemisphere |
| | Jupiter's Satellite Ganymede 1 |
| | Jupiter's Satellite Ganymede 2 |
| | Jupiter's Satellite Ganymede 8 |
| | Jupiter's Satellite Ganymede - View Of Uruk Sulcus Region |
| | Jupiter's Satellite Ganymede - View Of The Crater Osiris |
| | Jupiter's Satellite Ganymede |
| | Jupiter's Satellite Ganymede - Global View By Galileo Spacecraft |
| | Jupiter's Satellite Ganymede - Natural Color View |
| | Jupiter's Satellite Ganymede 17 |
| | Jupiter's Satellite Ganymede 19 |
| | Saturn's Satellite Rhea |
| | Saturn's Satellite Titan |
| | Saturn's Satellite Titan - Surface View |
| | Saturn's Satellite Enceladus |
| | Saturn's Satellite Mimas |
| | Saturn's Satellite Tethys |
| | Uranus' Satellite Ariel - Color Image From 170,000 Km |
| | Uranus' Satellite Oberon |
| | Uranus' Satellite Miranda - Color Image From 147,000 Km |
| | Uranus' Satellite Titania - Color Image From 500,000 Km |
| | Uranus' Satellite Titania |
| | Neptune - Leverrier And Adams Rings And Satellite Larissa |
| | Neptune's Satellite Larissa |
| | Neptune's Satellite Proteus |
| | 1989N1 (Neptune's satellite) |
| | Neptune's Satellite Triton - Two Days Before Voyager 2 Closest Approach |
| | Neptune's Satellite Triton |
| | Pluto - Map Of The Surface |
| satellites | Saturn - An Infrared View |
| | Saturn - Small Satellites |
| Saturn | Solar System Family |
| | Solar System Family Portrait II |
| | Saturn From Voyager 2 |
| | Saturn - False Color Image |
| | Saturn - Ring System |
| | Saturn's F-Ring |
| | Saturn - Aurorae |
| | Saturn - Hubble Observes A New Storm |
| | Saturn - An Infrared View |
| | Saturn's Satellite Rhea |
| | Saturn's Satellite Titan - Surface View |
| | Saturn's Satellite Dione |
| | Saturn's Satellite Enceladus |
| | Saturn's Satellite Mimas |
| | Saturn - Small Satellites |
| | Saturn's Satellite Tethys |
| | Voyager |
| Saturn's largest satellite | Saturn's Satellite Titan |
| Saturn's moon | Saturn's Satellite Dione |
| Saturn's ring system | Saturn - Ring System |
| Saturn's satellite | Saturn's Satellite Rhea |
| | Saturn's Satellite Tethys |
| Saturnian system | Saturn And Its Satellites |
| Saudi Arabia | The Earth - Northeast Africa And Saudi Arabia |
| | The Earth - Saudi Arabia,The Red Sea And Gulf Of Aden |
| | Earth - As Seen By Clementine Spacecraft |
| | Earth (India, Saudi Arabia) |
| scooter | Neptune |
| | Neptune - The Scooter And The Great Dark Spot |
| Scott | The Moon - Surface Picture Of Astronaut, Rover And Rim Of Hadley Rille |
| Sea of Fertility | The Moon - Apollo 11 Command Module Over The The Moon After Separation |
| Sea of Tranquility | The Moon - Southwestern Mare Tranquilitatis |
| | The Moon - Sea Of Tranquility Before Apollo 11 Touchdown |
| seasonal changes | Seasons On Uranus |
| Sedna Planitia | Venus - Lava Channel In Sedna Planitia |
| seismometer | The Moon - Astronaut Sets Up Easep |
| | The Moon - Astronaut Setting Up Scientific Experiments Package On The The Moon |
| Service Module | Apollo - Astronaut Jim Irvin Sets Up The First Lunar Roving Vehicle During Apollo 15 |
| Shepard | The Moon - Astronaut Next To A Large Boulder |
| Sher 25 | Life Cycle Of Stars In Nebula Ngc 3603 |
| Shoemaker-Levy 9 | Shoemaker-Levy 9 |
| Shorty Crater | The Moon - Close-Up Color Image Of The Orange Soil At Shorty Crater |
| Sierra Madre Oriental mountains | The Earth - Sierra Madre Oriental Mountains And The Gulf Of Mexico |
| Sif Mons | Venus - Eistla Regio |
| | Venus - Sif Mons |
| singly-ionized sulfur atoms | Gas Pillars In Eagle Nebula M16 |
| | Star-Birth Clouds In Eagle Nebula M16 |
| Sinusoidal Projection | Venus - Topographic Map From Pioneer Venus (Mercator Projection) |
| Skylab | Skylab |
| | Kohoutek |
| Smyth's Sea | The Earth - The Earthrise Over The Moon |
| soft x-rays | The Sun - From Yohkoh And From Nso (Comparison) |
| SOHO's EIT | The Sun - By Soho's Eit At Four Different Wavelenghts |
| solar panels | Hubble Space Telescope - Description |
| solar system | Solar System Family |
| | Voyager |
| Solar System Family | Solar System Family Portrait I |
| solar system's most remote planet | Pluto - Map Of The Surface |
| solar wind | Saturn - Aurorae |
| solar wind analyzers | The Moon - Astronaut Setting Up Scientific Experiments Package On The The Moon |
| solar wind experiment | The Moon - Astronaut Unloading The Experiments Package On The The Moon |
| Solid State Imager | The Earth - Mid-Pacific Ocean |
| Solid State Imaging camera | Jupiter's Satellite Europa - Surface Features |
| | Jupiter's Satellite Europa - False Color Image Of Surface Features |
| Solid State Imaging system | Jupiter's Satellite Europa 7 |
| | Jupiter's Satellite Europa - Surface View |
| | Jupiter's Satellite Europa 10 |
| | Jupiter's Satellite Europa 11 |
| | Jupiter's Satellite Europa 12 |
| | Jupiter's Satellite Europa 13 |
| Solid State Imaging television camera | Jupiter's Satellite Europa 6 |
| Somalia | The Earth - Saudi Arabia,The Red Sea And Gulf Of Aden |
| South America | The Earth - South America |
| | Earth (South America) |
| | The Earth - The Orinoco And Essequibo Rivers |
| South Pacific | The Earth - Antarctica |
| south polar ice cap | The Earth - As Seen By The Apollo 17 Crew Traveling Towards The Moon |
| South Pole | The Earth - Antarctica |
| | The Moon - Mosaic Of The South Pole |
| south-Pole-Aitken basin | The Earth And Moon From Galileo |
| | The Moon By Galileo Spacecraft |
| Southeastern Mare Imbrium | The Moon - Southeastern Mare Imbrium |
| southern constellation Ara (the Altar) | The Unveiling Of The Stingray Nebula |
| southern Florida | The Earth - Southern Florida And The Bahamas |
| southern polar cap | Mars - Southern Polar Cap |
| Soviet Venera 13 | Venus - Three-Dimensional Views |
| | Venus - Globes |
| | Venus - Surface Views |
| Soviet Venera 13 spacecraft | Venus - "Pancake Domes" In Alpha Regio |
| Soviet Venera 14 | Venus - Three-Dimensional Views |
| | Venus - Surface Views |
| Soviet Venera 14 spacecraft | Venus - "Pancake Domes" In Alpha Regio |
| Soviet Venera 9 and 10 | Venus - Surface Views |
| Soviet Venera spacecraft | Venus - Maat Mons |
| Space Telescope Imaging Spectograph | Jupiter - View Of The Auroras |
| | Saturn - Aurorae |
| Space Telescope Science Institute | Pluto And Charon |
| | Magnificent Details In A Dusty Spiral Galaxy |
| spacecraft | Mercury - Mosaic By Mariner 10 |
| | Venus - Three-Dimensional Views |
| | The Earth - Rendezvous Of Two Manned Space Vehicles Over The Pacific Ocean |
| | The Earth - As Seen By The Apollo 17 Crew Traveling Towards The Moon |
| | The Moon - By Hubble Space Telescope |
| | Jupiter's Satellite Ganymede 2 |
| | Jupiter's Satellite Ganymede 17 |
| | Jupiter's Satellite Ganymede 18 |
| | Saturn's Satellite Mimas |
| | Uranus - In True And False Color |
| | Neptune's Satellite Triton - Surface View |
| | Apollo - Astronaut Jim Irvin Sets Up The First Lunar Roving Vehicle During Apollo 15 |
| | Galileo |
| | Giotto |
| | Lunar Orbiter |
| | Magellan |
| | Pioneer Venus Orbiter |
| | Pluto Express |
| | Skylab |
| | Surveyor |
| | Viking Orbiter |
| | Voyager |
| | Voyager |
| | Hubble Space Telescope - Description |
| | Hubble Space Telescope - Fact Sheet |
| spiral galaxy NGC 4414 | Magnificent Details In A Dusty Spiral Galaxy |
| spiral- and elliptical-shaped galaxies | Sample Galaxies From The Hubble Deep Field |
| SRTM | Planet Earth - The Blue Marble |
| SSI | The Earth - Mid-Pacific Ocean |
| | The Moon - False Color Image |
| St. George crater | The Moon - Surface Picture Of Astronaut, Rover And Rim Of Hadley Rille |
| stages of the life cycle of stars | Life Cycle Of Stars In Nebula Ngc 3603 |
| star | Young Binary Stars - A Possible Planet? |
| | Betelgeuse |
| | Mira - Hst Separates Stars In The Mira Binary System |
| star clusters | Close-Up Views Of A Star Formation In The Antennae Galaxy |
| star tracker mosaic | The Moon By Clementine (Star Tracker Mosaic) |
| star WR124 | Wolf-Rayet - HST Sees Bright Knots Ejected From A Brillant Star |
| starbirth | "Papillon" Nebula Yields Secrets Of A Massive Star Birth |
| stars | Wolf-Rayet - HST Sees Bright Knots Ejected From A Brillant Star |
| Stickney | Mars' Satellite Phobos By Viking 1 |
| Stickney crater | Mars' Satellite Phobos And Stickney Crater From 1600 Km |
| Stingray nebula | The Unveiling Of The Stingray Nebula |
| STIS | The Moon - By Hubble Space Telescope |
| | Jupiter - View Of The Auroras |
| | Saturn - Aurorae |
| storm | Saturn - Hubble Observes A New Storm |
| | Saturn - An Infrared View |
| storms | Jupiter - Hubble Tracks Jupiter Storms |
| | Saturn - False Color Image |
| Story Musgrave | Hst Undergoing Preflight Processing At The Kennedy Space Center |
| strange rotation | Asteroid Toutatis - One Of The Strangest Objects In The Solar System |
| stratocumulus clouds | The Earth - Network Of Stratocumulus Clouds Sw Of The Canary Islands |
| STS 30 (Atlantis) flight | Magellan |
| STS 31 flight | Hst Undergoing Preflight Processing At The Kennedy Space Center |
| STS 34 fligh | Galileo |
| STS 61 flight | Hst Undergoing Preflight Processing At The Kennedy Space Center |
| Sudan | The Earth - Northeast Africa And Saudi Arabia |
| | The Earth - Sudan (As Sudd Swamp) |
| | The Earth - The Central Sahara Desert In Africa |
| sulfur dioxide | Venus - Cloud Tops Viewed By Hubble |
| sulfuric acid | Venus - Infrared Map Ii |
| | Venus - Cloud Tops Viewed By Hubble |
| sulfuric acid clouds | Venus - Infrared Map Ii |
| | Venus - Color Enhanced Image From 2.7 Million Km |
| sun | Solar System Family |
| | The Sun - From Yohkoh And From Nso (Comparison) |
| | The Sun - By Soho's Eit At Four Different Wavelenghts |
| | The Sun |
| | Sun - X-Ray Image |
| | Sun - Solar Disk In H-Alpha |
| super-hot star | Wolf-Rayet - HST Sees Bright Knots Ejected From A Brillant Star |
| supergiant | Life Cycle Of Stars In Nebula Ngc 3603 |
| supernova 1987A | Life Cycle Of Stars In Nebula Ngc 3603 |
| surface | Venus - "Pancake Domes" In Alpha Regio |
| | Venus - Three-Dimensional Views |
| | Europa (surface 3) |
| | Jupiter's Satellite Europa 9 |
| | Neptune's Satellite Triton - Surface View |
| | Pluto - Surface View |
| | Asteroid Vesta - Hubble Reveals A Huge Crater |
| surface map | Pluto - Map Of The Surface |
| Surveyor | Mars - Tithonium And Ius Chasma, Valles Marineris |
| | Surveyor |
| swamp | The Earth - Sudan (As Sudd Swamp) |
| Syria Planum | Mars - Eastern Tharsis And Noctis Labyrinthus |
| Syrtis Major Planus | Mars - Syrtis Major Hemisphere |
This is the Web Edition of "A Trip Into Space", a Coimbra-based electronic book on space science. Both the texts and the photos are by courtesy of National Aeronautics and Space Administration.
