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  2. List of directly imaged exoplanets - Wikipedia

    en.wikipedia.org/wiki/List_of_directly_imaged_e...

    In many cases it is not possible to have an exact value, and an estimated range is instead provided. The coldest and oldest planet directly imaged is Epsilon Indi Ab, which has six times Jupiter's mass, an effective temperature of 275 K, and an age of about 3.5 Ga. This list includes the four members of the multi-planet system that orbit HR 8799.

  3. Universe: The Definitive Visual Guide - Wikipedia

    en.wikipedia.org/wiki/Universe:_The_Definitive...

    The Universe book cover (2nd edition, 2007).. Universe: The Definitive Visual Guide is a 528-page, non-fiction book by nine British co-authors (Robert Dinwiddie, Philip Eales, David Hughes, Iain Nicolson, Ian Ridpath, Giles Sparrow, Pam Spence, Carole Stott and Kevin Tildsley) with a short Foreword by Sir Martin Rees, first published in 2005.

  4. Lists of planets - Wikipedia

    en.wikipedia.org/wiki/Lists_of_planets

    The best available theory of planet formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary disk. There are eight planets within the Solar System; planets outside of the solar system are also known as exoplanets.

  5. The Universe for Beginners - Wikipedia

    en.wikipedia.org/wiki/The_Universe_for_Beginners

    The Universe for Beginners, republished as Introducing the Universe, is a 1993 graphic study guide to cosmology written by Felix Pirani and illustrated by Christine Roche.The volume, according to the publisher's website, "recounts the revolutions in physics and astronomy," from "Aristotle to Newton," and, "Einstein to Quantum Mechanics," "that underlie the present-day picture of the universe."

  6. List of exoplanets discovered by the Kepler space telescope

    en.wikipedia.org/wiki/List_of_exoplanets...

    An artist's rendition of Kepler-62f, a potentially habitable exoplanet discovered using data transmitted by the Kepler space telescope. The list of exoplanets detected by the Kepler space telescope contains bodies with a wide variety of properties, with significant ranges in orbital distances, masses, radii, composition, habitability, and host star type.

  7. List of Solar System objects - Wikipedia

    en.wikipedia.org/wiki/List_of_Solar_System_objects

    Euler diagram showing the types of bodies orbiting the Sun. The following is a list of Solar System objects by orbit, ordered by increasing distance from the Sun.Most named objects in this list have a diameter of 500 km or more.

  8. Astronomy - Wikipedia

    en.wikipedia.org/wiki/Astronomy

    A planet or moon's interior heat is produced from the collisions that created the body, by the decay of radioactive materials (e.g. uranium, thorium, and 26 Al), or tidal heating caused by interactions with other bodies. Some planets and moons accumulate enough heat to drive geologic processes such as volcanism and tectonics.

  9. List of potentially habitable exoplanets - Wikipedia

    en.wikipedia.org/wiki/List_of_potentially...

    Kepler-1638b was thought to be a possibly habitable planet with a radius smaller than 2 R 馃湪 after the validation. However based on the later measurement of host star parallax by Gaia, the radius of the planet was revised upward to 3.226 +0.201 −0.315 R 馃湪, resulting in it being a ice giant like Neptune with poor prospect for habitability ...

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