Stars, Planets, and Galaxies

Illuminate the night sky with information on stars, planets, and galaxies, along with photos of celestial objects.

  • Planets of the solar system on a black background.
    How Long Is a Day on Each Planet?
  • hypergiant star
    How to Figure out the Mass of a Star
  • Dramatic image of Saturn.
    Why Does Saturn Have Rings Around It?
  • Person standing under a stone arch surrounded by the night sky.
    The 10 Closest Stars to Earth
  • Double Cluster NGC 869 NGC 884 in Perseus
    The Perseus Constellation
  • Silhouette Man Standing Against Star Field
    Amazing Astronomy Facts
  • NASA's Spitzer, Hubble, and Chandra space observatories teamed up to create this multi-wavelength, false-colored view of the M82 galaxy
    Irregular Galaxies: Oddly Shaped Mysteries of the Universe
  • Constellations of northern hemisphere spring.
    The Hercules Constellation: Location, Stars, Deep Sky Objects
  • Betelgeuse Star
    Which are the Largest Stars in the Universe?
  • Northern hemisphere autumn skies
    How to Find the Andromeda Constellation
  • star-forming region R136
    The Top 10 Most Massive Stars
  • Northern hemisphere summer constellations.
    How to Find the Libra Constellation in the Night Sky
  • black hole captured by Event Horizon Telescope
    An Introduction to Black Holes
  • Orion Constellation
    A Gallery of Constellation Pictures
  • spring skies of the northern hemisphere.
    How to Find the Virgo Constellation
  • Local20Group20Dark20Matter20and20stars.jpg
    Welcome to the Galactic Neighborhood: the Local Group of Galaxies
  • Northern hemisphere autumn constellations.
    How to Find the Pisces Constellation in the Night Sky
  • 1280px-Pleiades_large-1-.jpg
    Explore Astronomy's Messier Objects
  • Northern hemisphere autumn constellations.
    How to Find the Aquarius Constellation
  • Northern hemisphere autumn constellations.
    How to Find the Aries Constellation
  • Northern hemisphere autumn skies
    How to Spot the Pegasus Constellation
  • scorpius.jpg
    How to Spot the Scorpius Constellation
  • the summer skies of the northern hemisphere
    How to Find the Draco Constellation
  • the view of orion from the city and the country
    Tips for Urban Stargazers
  • Northern hemisphere summer constellations.
    How to Find the Sagittarius Constellation in the Night Sky
  • Southern hemisphere autumn sky.
    How to Find the Phoenix Constellation
  • constellation Taurus
    How to Find the Taurus Constellation
  • Northern hemisphere summer constellations.
    How to Find the Capricornus Constellation
  • 3_-2014-27-a-print.jpg
    Explore the Different Types of Galaxies
  • Northern hemisphere summer constellations.
    How to Find the Aquila Constellation
  • black hole in milky way core
    What's Happening in the Milky Way's Core?
  • Local fluff
    The Local Interstellar Cloud: An Overview
  • summer-triangle.jpg
    Explore a Celestial Triangle
  • clock_star.jpg
    Spin May Tell a Star's Age
  • magellanic clouds
    The Small Magellanic Cloud
  • The main stars of the Cassiopeia constellation form a bright "W' in the northern sky.
    How to Spot the Cassiopeia Constellation in the Night Sky
  • Northern hemisphere summer constellations.
    How to Find the Cygnus Constellation
  • The constellation lyra.
    How to Find the Lyra Constellation in the Night Sky
  • no-hemi.jpg
    How to Find the Boötes Constellation
  • The Discovery and Characteristics of the Icy, Remote Kuiper Belt
  • galaxy cluster in many wavelengths
    What Lies Between Galaxies?
  • artist's concept of gamma-ray burster
    Should You Be Worried about Gamma-ray Bursts?
  • 1280px-Alpha-_Beta_and_Proxima_Centauri.jpg
    Going Inside a Star to See How It Works
  • Eyes in the Sky
    Interacting Galaxies Have Interesting Results
  • eta carinae -- a hypergiant star
    What are Hypergiant Stars Like?
  • Two reasons Jupiter can't become a star are that it has insufficient mass and it formed like a planet and not like a protostar.
    Could Jupiter Become a Star?
  • star-forming region R136
    Blue Supergiant Stars: Behemoths of the Galaxies
  • a star cluster with massive stars.
    How Long Do Stars Live?
  • The constellation Orion and the red supergiant Betelgeuse.
    What Makes a Star a Red Supergiant?
  • latitude-pole-star.jpg
    The Ever-changing North Pole Star
  • hs-2009-14-a-large_web_galaxy_triplet.jpg
    Starburst Galaxies: Hotbeds of Star Formation
  • main sequence stars
    How Stars Change throughout Their Lives
  • Supernovae: Catastrophic Explosions of Giant Stars
  • The constellation Orion and the red supergiant Betelgeuse.
    How Did Stars Get Their Names?
  • Earth as a water world
    Explore Earth - Our Home Planet
  • gamma-ray sky
    Gamma Rays: The Strongest Radiation in the Universe
  • artist's concept of a magnetar
    Magnetars: Neutron Stars With a Kick
  • Galaxy NGC 5010 -- a lenticular galaxy which has features of both spirals and ellipticals.
    Lenticular Galaxies Are the Quiet, Dusty Stellar Cities of the Cosmos
  • PIA06890.jpg
    Journey Through the Solar System: Planets, Moons, Rings and More
  • cosmic rays
    Cosmic Rays
  • wormhole travel
    Wormholes: What Are They and Can We Use Them?
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