Related. 1  How To Remember Customary System Measurement Conversions - A Mnemonic Device For Cups, Pints, Quarts, Gallons by Lena Welch8. 2  Measurable Goals: Requirements Definition for Project Success by Sid Kemp1. 3  Fractal Geometry :: Fractals in Nature by dosters5.
The Engraved Hourglass Nebula (also known as MyCn 18) is a young planetary nebula in the southern constellation Musca about 8,000 light-years from Earth. It was discovered by Annie Jump Cannon and Margaret W. Mayall during their work on an extended Henry Draper Catalogue (the catalogue was built between 1918 and 1924).
Immature Black Widows have the same shape as the mature Widow but with dramatic color markings. An immature Widow, although much smaller that an adult, can still cause a painful and dangerous bite. As you can see, the characteristic hourglass marking is yellowish, not red, in this young female spider.