As comets move close to the Sun, they develop tails of dust and ionized gas. Comets have two main tails, a dust tail and a plasma tail. The dust tail appears whitish-yellow because it is made up of tiny particles â about the size of particles of smoke â that reflect sunlight. Dust tails are typically between 1 and 10 million kilometers (about 600,000 to 6 million miles) long.
Hyperhidrosis, or excessive sweating, is a common disorder which produces a lot of unhappiness. An estimated 2-3% of Americans suffer from excessive sweating of the underarms (axillary hyperhidrosis) or of the palms and soles of the feet (palmoplantar hyperhidrosis). Underarm problems tend to start in late adolescence, while palm and sole sweating often begins earlier, around the age 13 (on the average). Untreated, these problems may continue throughout life. Sweating is embarrassing, it stains clothes, ruins romance, and complicates business and social interactions.
Sweating occurs when the sweat glands in your skin secrete a salty fluid called sweat, or perspiration.Sweating is a normal function that serves to cool your body, often in hot or humid environments or when you exercise. Excessive sweating may be a symptom of an underlying disease, disorder or condition.The medical term for excessive sweating is hyperhidrosis.Hyperthyroidism (overactive thyroid) and hypoglycemia (low blood sugar) are just two of many conditions that may cause excessive sweating.xcessive sweating may be a symptom of an underlying disease, disorder or condition. The medical term for excessive sweating is hyperhidrosis. Hyperthyroidism (overactive thyroid) and hypoglycemia (low blood sugar) are just two of many conditions that may cause excessive sweating.