Noun. 1. thyroxine-hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells; thyroxine is 65% iodine. tetraiodothyronine, thyroxin, T. thyroid hormone-any of several closely related compounds that are produced by the thyroid gland and are active metabolically.hyroxine. n. 1. (Biochemistry) the principal hormone produced by the thyroid gland: it increases the metabolic rate of tissues and also controls growth, as in amphibian metamorphosis. It can be synthesized or extracted from the thyroid glands of animals and used to treat hypothyroidism.
The Sun is at an average distance of about 93,000,000 miles (150 million kilometers) away from Earth. It is so far away that light from the Sun, traveling at a speed of 186,000 miles (300,000 kilometers) per second, takes about 8 minutes to reach us.Like all of the other planets in our Solar System, Earth does not travel around the Sun in a perfect circle.his means that the distance between Earth and the Sun changes during a year. At its closest, the Sun is 91.4 million miles (147.1 million km) away from us. At its farthest, the Sun is 94.5 million miles (152.1 million km) away.
it is at its brightest when the venus distance from earth is the smallest the planet can be easy to see when the sun is low on the horizon it always lies about 47 from the sun the planet orbits faster than the earth so overtakes it every 584 dayshis is the closest that any planet comes to earth the farthest that venus ever gets from earth is 261 million km the means that the venus distance from earth can vary by an incredible 223 million km