[...]... ARTICLES… ASTEROIDS (VOLUME 2) • GALAXIES (VOLUME 2) PLANETS (VOLUME 2) ★ DID YO UK The Su n’s tem NOW? peratur is abou e on th t1 es 100 tim 0,000°-11,0 00° F urface es hott Tha er than day on a really t’s Earth! hot of the Sun 21 Answer: Galaxies are made up of stars and solar systems, not the other way around Minor Planets 22 H LI HT LEARN MORE! READ THESE ARTICLES… DINOSAURS: A MYSTERY DISAPPEARANCE... change spacecraft to travel to the Moon, another planet, or another space station Why is a space station called a satellite? LEARN MORE! READ THESE ARTICLES… MOON (VOLUME 2) • PLANETS (VOLUME 2) SOLAR SYSTEM (VOLUME 2) In November 20 00 the first three-person crew, an American and two Russians, occupied the still-growing International Space Station © NASA 16 ★ Answer: Since space stations orbit a planet,... lley’s Co met cou ld be seen in the sk y Just a he predic s ted, he d ied when Halley’s Comet w as again seen in th e sky, in 1910 24 COMETS Rocketing Masses with Fuzzy T ails T ★ LEARN MORE! READ THESE ARTICLES… ASTEROIDS (VOLUME 2) • ASTRONOMY (VOLUME 2) • SOLAR SYSTEM (VOLUME 2) Answer: Halley’s Comet generally comes around every 76 years, though sometimes it takes just 75 Derke/O’Hara/Stone he word... hungry times, or sickness Edmond Halley, who lived over 20 0 years ago, discovered about 24 different comets One that keeps coming back was named for him because he figured out when it would return Halley first saw it in 1759, and it reappeared in 1835, 1910, and 1986 The next time it comes near the Earth will be in the year 20 60 How old will you be then? 25 SE A T GH RCH LI True or False? On the Moon you... own galaxy LEARN MORE! READ THESE ARTICLES… SOLAR SYSTEM (VOLUME 2) • TELESCOPES (VOLUME 2) UNIVERSE (VOLUME 2) ? U KNOW DID YOons, unlike galaxies, areed gin ti le ima Constella that peop e ps of stars make pictures in th grou g to als tin im as connec med mostly for an ons t sky Na constellati nigh res, gical figu tors olo nd naviga and myth nomers a help astro rs still ain sta locate cert Our galaxy,... the military And there are space stations In the late 20 th century the United States, Russia, the European Space Agency, Japan, and Canada joined forces to build the International Space Station (the ISS) It is meant to have people on it all the time In 1998 the first two ISS modules were launched and joined together in space In November 20 00 the first three-person crew, an American and two Russians,... THESE ARTICLES… GALAXIES (VOLUME 2) • NUCLEAR ENERGY (VOLUME 2) UNIVERSE (VOLUME 2) It’s hard to believe, when you look up at the night sky, that all those twinkling stars are actually enormous balls of fire © Matthias Kulka/Corbis 10 ★ Answer: TRUE Black holes are former stars that have collapsed inward and now swallow up all material and light around them STARS 12 GALAXIES Star Clusters W T GH SE... weigh less than you do on Earth To find out what you would weigh on the Moon, take your weight and divide by 6 NASA/JPL/Caltech ★ LEARN MORE! READ THESE ARTICLES… GRAVITY (VOLUME 2) • SOLAR SYSTEM (VOLUME 2) • SPACECRAFT (VOLUME 2) 27 Watnderer in he Sky s B illions of years ago there was a gigantic swirling cloud of gas and dust This cloud packed together and became extremely hot Eventually, the center... to east Only Venus and Uranus rotate from east to west On these planets the Sun seems to rise in the west and set in the east LEARN MORE! READ THESE ARTICLES… ASTEROIDS (VOLUME 2) • SOLAR SYSTEM (VOLUME 2) STARS (VOLUME 2) 28 ? ts U KNOW DID YOhave found three planeedae, m ndro Scientists Upsilon A g the star r Sun Some think orbitin one ch like ou be life on a star mu ere could s th this mean planets... objects,” or simply “UFOs.” What do you think, are there creatures living on other planets? And how do you think they would live? ★ LEARN MORE! READ THESE ARTICLES… ASTRONAUTS (VOLUME 2) • SPACECRAFT (VOLUME 2) • UNIVERSE (VOLUME 2) 15 Answer: c) water, heat, and light Exploring the New Frontier O DID YOU KNOW? SE A T GH nce the Moon was the only important thing in orbit around planet Earth Today many objects . publisher. My First Britannica: Volume 2: Physical Sciences and Technology 20 08 Britannica. com may be accessed on the Internet at http://www .britannica. com. Encyclopædia Britannica, Britannica, . CHICAGO LONDON NEW DELHI PARIS SEOUL SYDNEY TAIPEI TOKYO MY FIRST BRITANNICA Physical Sciences and Technology 2 © 20 08 by Encyclopædia Britannica, Inc. International Standard Book Number:978-1-59339-476-9. (VOLUME 2) • PLANETS (VOLUME 2) SOLAR SYSTEM (VOLUME 2) E x p l o r i n g t h e N e w F r o n t i e r  Why is a space station called a satellite? S E A R C H L I G H T In November 20 00 the first