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Moons, the Sun and Earth in Space
Famous moons, moon phases, eclipses and the Sun-Earth-Moon system.
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61 cards
- How many natural satellites does Earth have?QuestionOne, the Moon
- How long does the Moon take to orbit Earth?QuestionAbout 27 days; phases repeat about every 29.5 days
- Phases of the MoonQuestionThe changing shapes of the lit part of the Moon we see
- New moonQuestionThe Moon is not visible because its lit side faces away
- Waxing crescentQuestionA growing sliver of the Moon
- First quarterQuestionHalf the Moon is lit, the right half in the Northern Hemisphere
- Waxing gibbousQuestionMore than half lit and growing
- Full moonQuestionThe whole face of the Moon is lit
- Waning gibbousQuestionMore than half lit and shrinking
- Third (last) quarterQuestionHalf the Moon is lit, the left half in the Northern Hemisphere
- Waning crescentQuestionA shrinking sliver of the Moon
- Why does the Moon have phases?QuestionWe see different amounts of its sunlit half as it orbits Earth
- Does the Moon make its own light?QuestionNo; it reflects sunlight
- Lunar eclipseQuestionEarth's shadow falls on the Moon
- Solar eclipseQuestionThe Moon passes between the Sun and Earth, blocking sunlight
- Total solar eclipseQuestionThe Moon completely covers the Sun's disk
- Is it safe to look at a solar eclipse without eye protection?QuestionNo; use special eclipse glasses
- CoronaQuestionThe Sun's outer atmosphere, seen during a total eclipse
- Craters on the Moon come fromQuestionImpacts of asteroids and meteoroids
- Maria (lunar seas)QuestionDark, flat plains of ancient lava on the Moon
- Who first walked on the Moon?QuestionNeil Armstrong in 1969
- Which mission landed first humans on the Moon?QuestionApollo 11
- How many Apollo missions landed people on the Moon?QuestionSix
- Gravity on the Moon compared to EarthQuestionAbout one-sixth
- Why does the same side of the Moon always face Earth?QuestionIt rotates once for each orbit (tidal locking)
- Moon landing year of the last Apollo missionQuestion1972, Apollo 17
- Largest moon in the solar systemQuestionGanymede, a moon of Jupiter
- Galilean moonsQuestionIo, Europa, Ganymede and Callisto, found by Galileo in 1610
- IoQuestionA volcanic moon of Jupiter
- EuropaQuestionAn icy moon of Jupiter with an ocean beneath its ice
- TitanQuestionSaturn's largest moon, with a thick atmosphere and lakes of methane
- EnceladusQuestionA small icy moon of Saturn that sprays water ice from its south pole
- Phobos and DeimosQuestionThe two small moons of Mars
- TritonQuestionNeptune's largest moon, which orbits backward
- CharonQuestionThe largest moon of Pluto
- MirandaQuestionA moon of Uranus with cliffs and grooves
- TitaniaQuestionThe largest moon of Uranus
- CallistoQuestionA heavily cratered moon of Jupiter
- MimasQuestionA small icy Saturn moon with one huge crater
- SunQuestionA star made mostly of hydrogen and helium
- Sun's age, aboutQuestion4.6 billion years
- Sun's surface temperature, aboutQuestion5,500 degrees Celsius
- Sun's core temperature, aboutQuestion15 million degrees Celsius
- What powers the Sun?QuestionNuclear fusion of hydrogen into helium
- How long does sunlight take to reach Earth?QuestionAbout 8 minutes
- SunspotQuestionA cooler, darker area on the Sun's surface
- Solar flareQuestionA sudden burst of energy from the Sun
- Solar windQuestionA stream of charged particles flowing from the Sun
- AuroraQuestionGlowing lights in the sky from solar particles hitting the atmosphere
- PhotosphereQuestionThe visible surface of the Sun
- Solar system formed fromQuestionA cloud of gas and dust about 4.6 billion years ago
- Earth's rotation periodQuestionAbout 24 hours
- Earth's orbit periodQuestionAbout 365.25 days
- Leap yearQuestionA year with an extra day, February 29, to fix the calendar
- Why do we have day and night?QuestionEarth rotates on its axis
- Summer in the Northern Hemisphere happens whenQuestionThe Northern Hemisphere tilts toward the Sun
- SatelliteQuestionAn object that orbits a planet
- Tidal forceQuestionThe Moon's gravity tugging on Earth's oceans
- SupermoonQuestionA full moon at its closest point to Earth, looking larger
- Blue moonQuestionThe second full moon in one calendar month
- Harvest moonQuestionThe full moon nearest the autumn equinox
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