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  2. Elephant trunk (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Elephant_trunk_(astronomy)

    The Rosette Nebula is an example of an unusual shape that an elephant trunk can assume. It has a double helix structure instead of the normal straight column. [ 10 ] The double helix is caused by the presence of magnetic fields and electric currents lined up along the trunk axis of the trunks.

  3. Star formation - Wikipedia

    en.wikipedia.org/wiki/Star_formation

    Westerhout 51 nebula in Aquila - one of the largest star factories in the Milky Way (August 25, 2020). Star formation is the process by which dense regions within molecular clouds in interstellar space—sometimes referred to as "stellar nurseries" or "star-forming regions"—collapse and form stars. [1]

  4. List of star-forming regions in the Local Group - Wikipedia

    en.wikipedia.org/wiki/List_of_star-forming...

    Composite image showing young stars in and around molecular cloud Cepheus B.. This is a list of star-forming regions located in the Milky Way Galaxy and in the Local Group.Star formation occurs in molecular clouds which become unstable to gravitational collapse, and these complexes may contain clusters of young stars and regions of ionized gas called H II regions.

  5. Herbig–Haro object - Wikipedia

    en.wikipedia.org/wiki/Herbig–Haro_object

    Herbig and Haro were working independently on studies of star formation when they first analysed the objects, and recognised that they were a by-product of the star formation process. Although HH objects are visible- wavelength phenomena, many remain invisible at these wavelengths due to dust and gas, and can only be detected at infrared ...

  6. Nebular hypothesis - Wikipedia

    en.wikipedia.org/wiki/Nebular_hypothesis

    This may give birth to planets in certain circumstances, which are not well known. Thus the formation of planetary systems is thought to be a natural result of star formation. A Sun-like star usually takes approximately 1 million years to form, with the protoplanetary disk evolving into a planetary system over the next 10–100 million years. [2]

  7. Young stellar object - Wikipedia

    en.wikipedia.org/wiki/Young_stellar_object

    A star forms by accumulation of material that falls in to a protostar from a circumstellar disk or envelope. Material in the disk is cooler than the surface of the protostar, so it radiates at longer wavelengths of light producing excess infrared emission. As material in the disk is depleted, the infrared excess decreases.

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