// For construction new question objects
function question(answer, support, question, a, b, c, d) {
	this.answer = answer;
	this.support = support;
	this.question = question;
	this.a = a;
	this.b = b;
	this.c = c;
	this.d = d;
	return this;
	}

// The array of questions, answers, options, and explanations
var units = new Array(
	new question("d", "The constellation Ursa Minor is also know as The Little Bear.", "In which constellation is the North Star, Polaris?", "Ursa Major", "Cancer", "Canes Venatici", "Ursa Minor"),
	new question("a", "In a solar eclipse, the Sun is hidden by the Moon.", "Which Solar System body is hidden during a solar eclipse (as seen from Earth)?", "Sun", "Moon", "Earth", "None of the above"),
	new question("b", "Largest first, the correct order is Jupiter, Saturn, Uranus and Neptune.", "Which of the following is the largest planet in the Solar System?", "Saturn", "Jupiter", "Uranus", "Neptune"),
	new question("b", "Rigel is a B type, Aldebaran is a K type and Antares is a M type.", "What is the Spectral Type of the Sun?", "B", "G", "K", "M"),
	new question("c", "M44 is also know as the Beehive cluster.", "What is the Messier Number of the star cluster in Cancer know as Praesepe?", "M12", "M36", "M44", "M77"),
	new question("b", "Callisto belongs to Jupiter, Hyperion and Mimas to Saturn.", "Only one of these moons belong to the planet Mars - which?", "Callisto", "Deimos", "Hyperion", "Mimas"),
	new question("a", "The Lyrid meteor shower is visible between April 19th and 25th.", "The Lyrid meteor shower is associated with which comet?", "Thatcher 1861 I", "West 1976 VI", "P/Halley", "P/Encke"),
	new question("a", "This results in 580 million tonnes of Helium generated per second.", "The Sun converts 584 million tonnes of Hydrogen to Helium every:", "Second", "Minute", "Hour", "Day"),
	new question("d", "The Big Dipper comprises Alkaid, Mizar/Alcor, Alioth, Megrez, Phecda, Merak and Dubhe.", "Which star is NOT a member of the Big Dipper (or Plough)?", "Megrez", "Mizar", "Phecda", "Procyon"),
	new question("c", "Asteroids are also known as Minor Planets.", "Between which two planets does the Asteroid Belt lie?", "Venus and Earth", "Neptune and Pluto", "Mars and Jupiter", "Jupiter and Saturn"),
	new question("d", "This is the fastest speed in the Universe.", "What is the speed of light?", "122,000 miles per second", "87,000 miles per second", "456,000 miles per second", "186,000 miles per second"),
	new question("c", "Aurorae are glows in the upper atmosphere of a planet caused by atomic particles in the solar wind.", "With which one of the following are Aurorae associated?", "Full Moon", "Meteor Shower", "Solar Wind", "Supernova"),
	new question("d", "The New General Catalogue is just one of a number used to catalogue deep sky objects.", "The NGC is an object catalogue compiled in 1888; what do the letters NGC mean? ", "Northern Galactic Catalogue", "Night Gazing Catalogue", "New Galactic Catalogue", "New General Catalogue"),
	new question("d", "Skylab operated for five years.", "What was the name of the first U.S. space station?", "Enterprise", "Galaxy I", "Eagle Eye", "Skylab"),
	new question("d", "The Magellan probe is just one of over twenty sent to Venus.", "Which planet did the Magellan space probe explore?", "Jupiter", "Mars", "Saturn", "Venus"),
	new question("b", "The Arecibo Radio Telescope has a 305m dish.", "Where is the Arecibo Radio Telescope sited?", "Arizona, U.S.A.", "Puerto Rico", "Chile", "Canary Islands"),
	new question("a", "Hercules also contains another, less bright globular, M92.", "Which constellation contains the globular star cluster M13?", "Hercules", "Draco", "Andromeda", "Taurus"),
	new question("a", "Vega lies in Lyra; Deneb is in Cygnus and Altair is in Aquila.", "Which three stars make up the \'Summer Triangle\'?", "Vega, Deneb and Altair", "Antares, Fomalhaut and Achemar", "Caster, Pollux and Capella", "Arcturus, Spica and Regulus"),
	new question("a", "The Serpent Bearer intrudes into the Zodiac but is not counted as part of it.", "Which constellation is known as the Serpent Bearer?", "Ophiuchus", "Andromeda", "Serpens", "Tucana"),
	new question("b", "Edwin Aldrin was one of twelve people to walk on the Moon.", "Who was the second astronaut to set foot on the Moon?", "Charles Conrad Jr.", "Edwin Aldrin", "Neil Armstrong", "None of these"),
	new question("b", "The Namibia Meteorite is made of iron and weighs about 60 tons.", "In which country did the largest known meteorite fall?", "Australia", "Namibia", "Turkey", "Egypt"),
	new question("d", "Full and New phases cause spring tides; First and Last Quarter phases cause neap tides.", "Which one of these Moon phases causes a spring tide on Earth?", "First Quarter", "Last Quarter", "Gibbous", "New"),
	new question("d", "Cassini also carries a small lander probe called Huygens.", "What is the name of the space probe due to arrive at Saturn in 2004?", "Voyager II", "SOHO", "Ulysses", "Cassini"),
	new question("d", "There are about 1800 know planetary nebulae in our Galaxy.", "With what event are planetary nebulae associated?", "Dust storm on a planet", "Supernova", "Comet breaking up", "Death of a small or intermediate size star"),
	new question("c", "Sunlight shining through lunar mountain valleys during a total solar eclipse causes this phenomenon.", "With which event is the phenomenon known as the \'diamond ring\' associated?", "Partial Solar Eclipse", "Lunar Eclipse", "Total Solar Eclipse", "Sunset over water"),
	new question("a", "This radio telescope is operated by the University of Manchester, UK.", "What type of telescope is the main instrument at Jodrell Bank, U.K.?", "Radio Telescope", "X-ray Telescope", "Ultra Violet Telescope", "Visible Light Telescope"),
	new question("b", "Luna 2 weighed just 390kg.", "In 1959, the first probe hit the Moon\'s surface; what was it\'s name?", "Eagle", "Luna 2", "Saturn V", "Lunar Prospector"),
	new question("d", "You need large binoculars or a telescope to see M33.", "M33 is a face-on spiral galaxy in which constellation?", "Pisces", "Cygnus", "Scutum", "Triangulum"),
	new question("a", "The name blazar comes from an amalgamation of BL Lacertae and quazar.", "What is a blazar?", "Violently variable quasar", "Massive blue star", "Storm on Neptune", "Blue coloured meteor"),
	new question("b", "The Hyades cluster is about 130 light-years away.", "In which constellation is the Hyades star cluster?", "Cassiopeia", "Taurus", "Lyra", "Lynx"),
	new question("b", "Earthshine can be easily seen up to four days after New Moon.", "What is Earthshine?", "Badly made \'Moonshine\'", "Sunlight reflected onto the Moon from the Earth", "Sunlight reflected onto the Earth from the Moon", "Light pollution from the Earth\'s night side"),
	new question("a", "Also of note; Sagittarius is the southernmost of the Zodiacal constellations.", "Which constellation holds the most Messier objects?", "Sagittarius", "Scorpius", "Leo", "Hydra"),
	new question("d", "Large but faint constellation to the east of Orion.", "What creature does the constellation Monoceros represent?", "Swordfish", "Dragon", "Watersnake", "Unicorn"),
	new question("b", "There is 29 days 12.5 hours between one New Moon and the next.", "Counting New Moon as Day 0 of a lunation, when does a Full Moon occur?", "Between day 7 and 8", "Between day 14 and 15", "Between day 20 and 21", "Between day 28 and 29"),
	new question("c", "A bright meteor can somtimes leave a train which lasts several minutes.", "A bright meteor will sometimes leave a trail for a short time; what is the correct term for this trail?", "Plume", "Jet", "Train", "Stream"),
	new question("b", "Proxima Centauri is about 250,000 times further away from Earth than our own star, the Sun.", "What is the name of the second closest star to Earth?", "The Sun", "Proxima Centauri", "Betelgeuse", "Capella"),
	new question("b", "The first orrey was made by Charles Boyle, the Earl of Orrey.", "What is an Orrery?", "Astronomy lecture", "Mechanical model of the Solar System", "A rocket\'s fuel tank", "Type of crater on Mars"),
	new question("b", "They are Lupus, Circinus, Triangulum Australe, Ara and Scorpius.", "How many constellations border the southern constellation Norma?", "4", "5", "6", "7"),
	new question("d", "The two parts of Serpens are seperated by Ophiuchus.", "Which constellation is divided into two seperate areas?", "Aquila", "Vulpecula", "Bootes", "Serpens"),
	new question("d", "Carolyn Shoemaker found the comet on a photographic plate on 25th March 1993.", "What was the name of the comet which crashed into Jupiter in 1994?", "West", "Hale-Bopp", "Hyakutake", "Shoemaker-Levy 9"),
	new question("d", "This cycle of activity was first noted by the German amateur astronomer Heinrich Schwabe.", "Sunspot activity on the Sun goes through a cycle of maximum and minimum activity every:", "1 year", "4 years", "7 years", "11 years"),
	new question("a", "The centre of the Crab Nebula contains a pulsar.", "What type of object is the Crab Nebula (M1) in the constellation Taurus?", "Supernova remnant", "Open star cluster", "Globular star cluster", "Planetary nebula"),
	new question("d", "Sporadic meteors can be seen on most nights and are usually more numerous after midnight.", "What is the term used to describe a meteor which is not associated with any meteor shower?", "Primary", "Loner", "Spark", "Sporadic"),
	new question("d", "A day on Uranus lasts 17.2 Earth hours.", "How long is the planet Uranus\'s year?", "1 Earth year", "25.7 Earth years", "42.4 Earth years", "84 Earth years"),
	new question("d", "Also termed the counterglow, the Gegenschein is best seen near midnight in early autumn or early spring.", "With which other sky phenomenon is the Gegenschein associated?", "Aurorae", "Green flash", "Noctilucent clouds", "Zodiacal light"),
	new question("c", "Up to 150,000 Leonids were seen in the 1966 storm.", "Baring perturbations by Jupiter, how often does the Leonid meteor storm occur?", "Every 9 years", "Every 20 years", "Every 33 years", "Every 49 years"),
	new question("b", "The best time to attempt a Messier Marathon is late March.", "What is a Messier Marathon?", "An attempt to view all the Messier objects visible to the naked eye", "An attempt to view all the Messier objects in one night", "An attempt to view all the Messier objects in one year", "An attempt to sketch all the Messier objects from memory"),
	new question("a", "Annie worked at the Harvard College Observatory, Massachusetts.", "With what task was the astronomer Annie Jump Cannon associated?", "Classifying the spectra of stars", "Calculating the distance to nearby stars", "Taking the first photograph of a comet", "Compiling a catalogue of variable stars"),
	new question("d", "Lots of meteoroids in a group is called a meteor swarm.", "What is the correct term for a meteor before it enters the Earth\'s atmosphere?", "Meteorette", "Meteorising", "Meteorite", "Meteoroid"),
	new question("b", "One parsec is equal to 3.26 light-years.", "What does the unit \'parsec\' measure?", "Colour Temperature", "Distance", "Lunar Phase", "Time"),
	new question("b", "Nicolaus Copernicus first proposed this idea in the sixteenth century.", "Who first proposed the idea that the planets revolved around the Sun, not the Earth?", "Ptolemy", "Copernicus", "Galileo", "Newton"),
	new question("b", "A refracting telescope does not have a spider.", "In a reflecting telescope, what does the \'spider\' do?", "Makes viewing difficult due to cobwebs", "Holds the secondary mirror in place", "Holds the primary mirror in place", "Holds the eyepiece in place"),
	new question("b", "Eyepieces usually come in either 1.25 inch or 2 inch diameter sizes.", "Ramsden, Orthoscopic, Plosl and Erfle are examples of:", "Binoculars", "Eyepieces", "Telescopes", "Telescope mounts"),
	new question("b", "Hipparchus first used a system of magnitudes from 1 to 6.", "How much brighter is a magnitude 0 star compared to a magnitude 1 star?", "1.5119x brighter", "2.5119x brighter", "3.5119x brighter", "4.5119x brighter"),
	new question("a", "Transits of Venus occur about every 100 years in pairs, 8 years apart.", "What happens during a Transit of Venus (as viewed from Earth)?", "Venus moves across the face of the Sun", "Venus moves behind the Sun", "The Moon moves in front of Venus", "Venus moves behind Mercury"),
	new question("a", "The asteroid Ceres was the first discovered in 1801.", "What type of object is Ceres?", "Asteroid", "Comet", "Lunar Crater", "Moon of Neptune"),
	new question("a", "The Kuiper Belt is home to unknown numbers of comets.", "Where is the Kuiper Belt located?", "Beyond the orbit of Pluto", "Southern hemisphere of Jupiter", "Northern hemisphere of Saturn", "The Sun\'s equator"),
	new question("a", "The 7 should be read as 7x and means the image is magnified 7 times.", "If binoculars are rated 7x50, what does the \'50\' figure represent?", "Diameter of front elements in millimetres", "Closest focusing point in metres", "Dept of carrying case in centimetres", "Angle of view in arc minutes"),
	new question("c", "Asteroids are identified by both a number and a name.", "With what type of object is the phrase \'6000 United Nations\' associated?", "International Space Station", "Comet", "Asteroid", "Planned Lunar base"),
	new question("a", "These galaxies lie in the constellation Pegasus.", "What type of objects are Stephan\'s Quintet?", "Galaxies", "Lunar craters", "Artificial satellites", "Moons of Saturn"),
	new question("a", "The Vernal Equinox occurs about March 21st each year.", "When does the Earth\'s Vernal Equinox occur?", "March", "June", "September", "December"),
	new question("d", "H-alpha filters show solar activity more clearly.", "What is normally photographed using a H-alpha filter?", "The Moon", "Star clusters", "Aurorae", "The Sun"),
	new question("d", "Named after the French astromoner Andre Danjon.", "What is the Danjon Scale used to measure?", "Solar prominences", "Stages of an annular eclipse", "Length of a comet\'s tail", "Darkness of a Lunar eclipse"),
	new question("b", "The exact location is RA 12h 51.4m, Dec 27 Degrees 7.7 Minutes.", "In which constellation is the north galactic pole?", "Cepheus", "Coma Berenices", "Draco", "Ursa Minor"),
	new question("b", "The rings are difficult to see when edge-on.", "How often do the rings of Saturn appear edge-on as viewed from Earth?", "6.75 and 7.75 years alternately", "13.75 and 15.75 years alternately", "24.25 and 26.25 years alternately", "46.75 and 48.75 years alternately"),
	new question("d", "P/Halley is the most famous periodic with a period of 76 years.", "If a comet name is prefixed with P (such as P/Biela), what does this mean?", "It\'s a photographic comet", "It\'s a comet whose orbit goes out to Pluto", "It\'s orbit is problematic to predict", "It\'s a periodic comet"),
	new question("b", "Solar eclipses outnumber lunar eclipses by almost 5 to 3.", "In years with seven eclipses, there are either:", "Three solar \& four lunar -or- two solar \& five lunar", "Five solar \& two lunar -or- four solar \& three lunar", "Six solar \& one lunar -or- seven solar and no lunar", "This is wrong - there cannot be seven eclipses in one year"),
	new question("b", "The Eclipse year lasts 346.62003 days.", "The time taken for the Sun to return to the same node of the Moon\'s orbit is termed the?", "Anomalistic year", "Eclipse year", "Sidereal year", "Tropical year"),
	new question("c", "There is also a first and second contact.", "During a total solar eclipse, third contact is when...", "The Sun and Moon first touch", "Totality commences", "Totality ends", "The Sun and Moon no longer touch"),
	new question("b", "Mu Cephei is a deep red colour.", "By what name is the star Mu Cephei better know as?", "Barnard\'s Star", "Herschel\'s Garnet Star", "Kapteyn\'s Star", "The Blaze Star"),
	new question("c", "This famous variable ranges from 6th magnitude down to 14th magnitude at its faintest.", "What is the star R Coronae Borealis noted for?", "It\'s very red in colour", "It\'s a classic double star", "It\'s a classic variable star", "It\'s moving through space faster than any other star"),
	new question("a", "The Moon takes 27.3 days to both orbit Earth and rotate once.", "Why does the Moon show the same face to Earth if it rotates on it\'s axis?", "It takes exactly the same time to complete one orbit of Earth as it does to rotate once on it\'s axis", "It\'s rotating very slowly - we do not notice it", "The Moon\'s other side points towards Earth during daylight", "The Moon does not spin on it\'s axis"),
	new question("d", "A year on Mercury lasts only 88 Earth days.", "How long is a day on Mercury?", "1 Earth day", "12 Earth hours", "30.5 Earth days", "58.7 Earth days"),
	new question("b", "The Straight Wall is a 250m wide by 128km long fault on the Lunar surface.", "In which area of the Moon is the feature known as the \'Straight Wall\' located?", "Mare Frigoris", "Mare Nubium", "Mare Imbrium", "Mare Humorum"),
	new question("b", "You can see examples of his work at www.hardyart.demon.co.uk", "David A Hardy is a famous...?", "Astronaut", "Space Artist", "NASA Scientist", "Professional Astronomer")
	);