A nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form. For this reason, some nebulae are called "star nurseries."
Yellow is the color between orange and green on the spectrum of visible light. It is evoked by light with a dominant wavelength of roughly 570-590 nm. It is a primary color in subtractive color systems, used in painting or color printing. In the RGB color model, used to create colors on television and computer screens, yellow is a secondary color made by combining red and green at equal intensity. Carotenoids give the characteristic yellow color to autumn leaves, corn, canaries, daffodils, and lemons, as well as egg yolks, buttercups, and bananas. They absorb light energy and protect plants from photodamage. Sublight has a slightly yellowish hue, due to the surface temperature of the sun.
Sadness is an emotional pain, associated with, or characterized by, feelings of disadvantage, loss, despair, grief, helplessness, disappointment, and sorrow. An indiviual experiencing sadness may become quiet or lethargic, and withdraw themselves from others. An example of severe sadness is depression a mood which can be brought on by major depressive disorder or persistent depressive disorder. Crying can be an indication of sadness. Sadness is one of the six basic emotions described by Paul Ekman, along with happiness, anger, surprise, fear, and disgust.
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