The Orion Molecular Cloud Complex

The Orion Molecular Cloud Complex (or, simply, the Orion Complex) is a large group of bright nebulae, dark clouds, and young stars in the Orion constellation. The cloud is between 1 500 and 1 600 light-years [ … ]

Pluto in the Kuiper belt in the Solar System

The Kuiper belt, sometimes called the Edgeworth–Kuiper belt, is a circumstellar disc in the Solar System beyond the (known) planets, extending from the orbit of Neptune (at 30 AU) to approximately 50 AU from the Sun.   What is the Kuiper belt? It is [ … ]

N44 located in a satellite galaxy of the Milky Way

N44 is an emission nebula with superbubble structure located in the Large Magellanic Cloud, a satellite galaxy of the Milky Way in the constellation Dorado.   What is the emission nebula N44? Originally catalogued in Karl Henize’s “Catalogue of H-alpha emission stars [ … ]

What everybody ought to know about planets!

The term planet is ancient, with ties to history, astrology, science, mythology, and religion. Several of them in the Solar System can be seen with the naked eye.   What are planets? These were regarded by [ … ]

The Cygnus Loop, a supernova remnant

The Cygnus Loop  or Sharpless 103 is a large supernova remnant  in the constellation Cygnus, an emission nebula measuring nearly 3° across. Some arcs of the loop, known collectively as the Veil Nebula or Cirrus Nebula, emit in the [ … ]

Venus, the second planet from the sun

Venus is the second planet from the Sun, orbiting it every 224.7 Earth days. What is Venus? Venus is the second planet from the Sun, orbiting it every 224.7 Earth days. It has the longest rotation period (243 days) of any planet in the Solar System and [ … ]

The Sombrero Galaxy, visible with amateur telescopes

Sombrero Galaxy or Messier Object 104 is an unbarred spiral galaxy in the constellation Virgo located 31 million light-years from Earth. The galaxy has a diameter of approximately 50,000 light-years, 30% the size of the Milky Way.   What is the Sombrero Galaxy? [ … ]

The Sadr region which contains many dark nebulae

The Sadr region, or IC 1318, is the diffuse emission nebula surrounding Sadr or Gamma Cygni. Sadr lies in the center of Cygnus’s cross.   What is the Sadr region? The Sadr region is one of the surrounding nebulous regions; others [ … ]