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The Longest DayThe filmmakers shed light on people vulnerable to extreme heat, including students in Indonesia, the elderly in Singapore and urban residents of overcrowded areas in India.

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Now PlayingThe Longest DayThe filmmakers shed light on people vulnerable to extreme heat, including students in Indonesia, the elderly in Singapore and urban residents of overcrowded areas in India.0InfinityAsking the question of whether the universe is indeed infinite or finite; perhaps there are an infinite number of other universes, possibly existing in different dimensions.

Cosmic Journeys Series

• Now Playing26minIs the Universe Infinite?
• Now Playing26minMars: World That Never Was
• Now Playing26minSaturn's Mysterious Moons
• Now Playing26minCrashing Into the Moon
• Now Playing26minHow Large is the Universe?
• Now Playing25minThe Incredible Journey of Apollo 12
• Now Playing25minThe Most Powerful Objects in the Universe
• Now Playing25minAttack of the Sun
• Now Playing26minMysteries of a Dark Universe
• Now Playing25minThe Riddle of Antimatter
• Now Playing25minBirth of the Moon
• Now Playing26minThe Largest Black Holes in the Universe
• Now Playing25minBirth of a Black Hole

Cosmic Vistas Series

• Now Playing24minNight Fire
• Now Playing24minVirtual Universe
• Now Playing24minStargazer's Paradise
• Now Playing23minHubble's Renaissance
• Now Playing24minSuperscopes
• Now Playing24minCosmic Rainbow
• Now Playing24minSeasons of Saturn
• Now Playing24minVesta Unveiled
• Now Playing24minWater Worlds
• Now Playing24minGravity
• Now Playing24minScience and the Shuttle
• Now Playing24minLanding on Mars
• Now Playing26minThe Big Bang
• Now Playing23minMilky Way
• Now Playing23minThe Hot Zone
• Now Playing23minCosmic Rays
• Now Playing23minThe Fermi Paradox
• Now Playing23minLandsat
• Now Playing27minEye of the Beholder
• Now Playing27minPainted By Light
• Now Playing27minColour
• Now Playing27minCosmic Perspective
• Now Playing27minGrand Design
• Now Playing27minVanishing Points

Disasters in Space

• Now Playing25minReturn to Disaster
• Now Playing26minMars or Bust
• Now Playing25minSpace Shuttle Shuffle
• Now Playing25minThe End of Genesis
• Now Playing26minTrains, Rockets, and Pains
• Now Playing26minColumbia

Space: The New Frontier Series

• Now Playing25minThe Cryosphere
• Now Playing25minSet Course for the Heart of the Sun
• Now Playing25minTickets Please
• Now Playing24minMercury or Bust
• Now Playing25minHyabusa 2
• Now Playing25minEyes to the Heavens
• Now Playing25minMartian Attractions
• Now Playing25minCubes
• Now Playing25minProving Einstein
• Now Playing25minWhere are all the Aliens?
• Now Playing25minStar Light Star Bright
• Now Playing25minMoon Shine
• Now Playing25minRising Tides
• Now Playing25minEarth's Evil Twin
• Now Playing25minIncreasing Orbit
• Now Playing25minMountains in the Dark
• Now Playing25minOceans in the Sky
• Now Playing25minWebb of Life
• Now Playing25minPeering Into the Abyss
• Now Playing25minNext Big Leap