Along with the brown bear, it is one of only two of the eight modern bear species not considered globally threatened with extinction by the IUCN. American black bears often mark trees using their teeth and claws as a form of communication with other bears, a behavior common to many species of bears.
Planetary nebulae are astronomical objects made up primarily of gaseous materials. They are extended in size and fuzzy in appearance, and generally show some degree of symmetry. The nebula is illuminated by a central star, which sometimes is too faint to be seen.
NGC 1514: When William Herschel saw the bright star in the heart of this planetary nebula, he realized that he wasn't looking at clusters but through gas and dust. As a result, he coined the name planetary nebula, because they shared the coloration of the recently discovered Uranus.Saturn Nebula NGC 7009: Located in the constellation Aquarius, the Saturn Nebula, or NGC 7009, has a bright central star surrounded by a football shaped array of gas and dust.Stingray Nebula (Hen-1357): The youngest known planetary nebula, Hen-1357 is as large as 130 solar systems.GC 1514: When William Herschel saw the bright star in the heart of this planetary nebula, he realized that he wasn't looking at clusters but through gas and dust. As a result, he coined the name planetary nebula, because they shared the coloration of the recently discovered Uranus.