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  2. Interstellar travel - Wikipedia

    en.wikipedia.org/wiki/Interstellar_travel

    Distances between the planets in the Solar System are often measured in astronomical units (AU), defined as the average distance between the Sun and Earth, some 1.5 × 10 8 kilometers (93 million miles). Venus, the closest planet to Earth is (at closest approach) 0.28 AU away. Neptune, the farthest planet from the Sun, is 29.8 AU away.

  3. Outer space - Wikipedia

    en.wikipedia.org/wiki/Outer_space

    Outer space. Being essentially empty, outer space allows the earliest (redder) galaxies to be viewed without obstruction, as in the Webb's First Deep Field image. Outer space (or simply space) is the expanse that exists beyond Earth's atmosphere and between celestial bodies. [1] It contains ultra-low levels of particle densities, constituting a ...

  4. Oort cloud - Wikipedia

    en.wikipedia.org/wiki/Oort_cloud

    The presumed distance of the Oort cloud compared to the rest of the Solar System. The Oort cloud is thought to occupy a vast space somewhere between 2,000 and 5,000 AU (0.03 and 0.08 ly) [11] from the Sun to as far out as 50,000 AU (0.79 ly) or even 100,000 to 200,000 AU (1.58 to 3.16 ly).

  5. Heliosphere - Wikipedia

    en.wikipedia.org/wiki/Heliosphere

    The heliopause is the final known boundary between the heliosphere and the interstellar space that is filled with material, especially plasma, not from the Earth's own star, the Sun, but from other stars. [46] Even so, just outside the heliosphere (i.e. the "solar bubble") there is a transitional region, as detected by Voyager 1. [47]

  6. ʻOumuamua - Wikipedia

    en.wikipedia.org/wiki/ʻOumuamua

    When it was first observed, it was about 33 million km (21 million mi; 0.22 AU) from Earth (about 85 times as far away as the Moon) and already heading away from the Sun. ʻOumuamua is a small object estimated to be between 100 and 1,000 metres (300 and 3,000 ft) long, with its width and thickness both estimated between 35 and 167 metres (115 ...

  7. Interstellar probe - Wikipedia

    en.wikipedia.org/wiki/Interstellar_probe

    Model of the design for Interstellar Probe; antennas travel far beyond bounds of picture. Interstellar Probe (spacecraft) (ISP) (2018–) A NASA funded study, led by the Applied Physics Laboratory, on possible options for an interstellar probe. The nominal concept would launch on a SLS in the 2030s. It would perform either a fast Jupiter flyby ...

  8. Cosmic distance ladder - Wikipedia

    en.wikipedia.org/wiki/Cosmic_distance_ladder

    The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A direct distance measurement of an astronomical object is possible only for those objects that are "close enough" (within about a thousand parsecs) to Earth.

  9. New Horizons - Wikipedia

    en.wikipedia.org/wiki/New_Horizons

    New Horizons is an interplanetary space probe launched as a part of NASA 's New Frontiers program. [5] Engineered by the Johns Hopkins University Applied Physics Laboratory (APL) and the Southwest Research Institute (SwRI), with a team led by Alan Stern, [6] the spacecraft was launched in 2006 with the primary mission to perform a flyby study ...

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