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  2. Europa Clipper - Wikipedia

    en.wikipedia.org/wiki/Europa_Clipper

    Europa Clipper is designed to follow up on evidence for a subsurface ocean underneath Europa's ice crust, found using the Galileo spacecraft which orbited Jupiter from 1995 to 2003. Plans to send a spacecraft to Europa were initially conceived with projects such as Europa Orbiter and Jupiter Icy Moons Orbiter , in which a spacecraft would be ...

  3. Spinning roller coaster - Wikipedia

    en.wikipedia.org/wiki/Spinning_roller_coaster

    The trains have eight cars, with each car's two seats side by side. Like the Maurer Söhne and Gerstlauer spinning coasters, this "twist and turn coaster" features a twisted track layout. Three of these models have been built around the world. Another spinning coaster with trains, Euro-Mir, was built by MACK Rides of Germany in 1997 at Europa ...

  4. Gravity railroad - Wikipedia

    en.wikipedia.org/wiki/Gravity_railroad

    A gravity railroad (American English) or gravity railway (British English) is a railroad on a slope that allows cars carrying minerals or passengers to coast down the slope by the force of gravity alone. The speed of the cars is controlled by a braking mechanism on one or more cars on the train. The cars are then hauled back up the slope using ...

  5. HOn30 gauge - Wikipedia

    en.wikipedia.org/wiki/HOn30_gauge

    The term HOn30 (and sometimes HOn2½) is generally used when modelling American prototypes while H0e is used for European prototypes. In Britain, the term OO9 is used. [1] All these terms refer to models of narrow-gauge railways built to the world's most popular model railway scale of HO (1:87) but using a track gauge of 9 mm (0.354 in)—the gauge used for N scale models of standard-gauge ...

  6. Europa (moon) - Wikipedia

    en.wikipedia.org/wiki/Europa_(moon)

    Europa's gravity is approximately 13% of Earth's. The temperature on Europa varies from −160 °C at the equator, to −220 °C at either of its poles. [145] Europa's subsurface ocean is thought to be significantly [clarification needed] warmer however. It is hypothesized that because of radioactive and tidal heating (as mentioned in the ...

  7. Physics of roller coasters - Wikipedia

    en.wikipedia.org/wiki/Physics_of_roller_coasters

    As the car approaches a loop, the direction of a passenger's inertial velocity points straight ahead at the same angle as the track leading up to the loop. As the car enters the loop, the track guides the car up, moving the passenger up as well. This change in direction creates a feeling of extra gravity as the passenger is pushed down into the ...

  8. Scalextric - Wikipedia

    en.wikipedia.org/wiki/Scalextric

    Scalextric Digital: Released in 2004, Scalextric Digital is compatible with Sport. It allows up to 6 cars on a 2 lane track at one time, with each car fully controllable. This was a feature previously unavailable from Scalextric. Scalextric Start: Released in 2010, Scalextric Start aims to be a basic track for children.

  9. J002E3 - Wikipedia

    en.wikipedia.org/wiki/J002E3

    [1] [2] [3] The stage was intended to be injected into a permanent heliocentric orbit in November 1969, but is now believed instead to have gone into an unstable high Earth orbit which left Earth's proximity in 1971 and again in June 2003, with an approximately 40-year cycle between heliocentric and geocentric orbit.