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Space^19 The biggest planet, Jupiter, is 11 times wider than Earth. It is made mainly of hydrogen and helium. Its rapid spin mak ...
20 Space This giant planet has a magnificent system of shining rings circling its equator. Saturn is the second largest planet i ...
Space^21 Dwarf planets are miniature planets, similar to the largest moons of the major planets, but in orbit around the Sun in ...
22 Space WHERE DO COMETS COME FROM? Comets seem to be bits left over from the formation of the Solar System. Some are in a belt ...
Space^23 A meteor, or shooting star, is a streak of light in the sky caused by a piece of dust or rock from space burning up in ...
24 Space Great globes of intensely hot gas called stars pour light and heat into space. A star is born in a vast. NEBULA of gas ...
Space^25 A black hole is a region of space with such strong gravity that it swallows up everything that comes near it, even ligh ...
26 Space The Universe is everything that exists – space and all the stars, planets, and other matter it contains. Astronomers be ...
HOW MANY DIFFERENT GALAXIES ARE THERE? The Universe contains a hundred billion galaxies, and there are four main types. Spiral g ...
28 Space A spacecraft that travels in a steady path, or orbit, around the Earth is called a satellite. Satellites receive and se ...
Launched from the space shuttle Discovery in 1990, the Hubble Space Telescope (HST) orbits about 600 km (370 miles) above Earth. ...
30 Space People began travelling in space in 1961 in tiny spacecraft called capsules, which were launched from Earth by powerful ...
Space^31 Anyone who travels in space is called an astronaut. The Russians call their space travellers cosmonauts. Most astronaut ...
32 Space The USA created the space shuttle as a reusable space vehicle for astronauts and cargo. Five shuttles flew between 1981 ...
Space^33 The ISS is currently the only space station in orbit around the Earth. It has been built from more than 100 separate ma ...
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STORMS 54 EROSION 55 RIVERS 56 CAVES 57 ICE 58 COASTS 59 ENERGY RESOURCES 60 CLIMATE 62 CLIMATE ZONES 63 HUMAN IMPACT 64 FARMING ...
36 Earth Planet Earth is a dense, rocky ball about 12,750 km (7,920 miles) across. It is one of eight planets circling our local ...
Earth^37 Seasons are regular weather patterns in different places on the Earth’s surface caused by the Earth’s tilt. At any time ...
38 Earth Earth science is the study of our planet’s physical characteristics, from earthquakes to raindrops, and floods to fossi ...
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