Science

A:

An extra day is added to February every four years to synchronize the Gregorian calendar with the solar calendar. One year in the solar calendar is 5 hours, 48 minutes and 46 seconds longer than one year in the Gregorian calendar, the calendar used by most modern countries.

See Full Answer
Filed Under:
    • What is the primary purpose of an astronomical telescope?

      Q: What is the primary purpose of an astronomical telescope?

      A: The astronomical telescope is a central apparatus used to study distant planets, stars and moons from the Earth. Astronomer Galileo Galilei famously used the earliest telescopes in 1610 to prove the heliocentric solar system theory put forth by Nicolaus Copernicus in the early 16th century.
      See Full Answer
      Filed Under:
    • Why is it that stars twinkle but planets do not?

      Q: Why is it that stars twinkle but planets do not?

      A: Stars twinkle because they are point light sources. Passing through the atmosphere, the small beam of light constantly shifts by bouncing off particles in the air. Planets are closer, so they appear as discs, with the shifting of light from one side cancelling out the other.
      See Full Answer
      Filed Under:
    • What happens to stars as they age?

      Q: What happens to stars as they age?

      A: Stars on the main sequence that are the same size as the Sun begin as yellow stars and turn into red giants as their hydrogen fuel runs out. Other stars shrink or explode, depending on their size.
      See Full Answer
      Filed Under:
    • What are some solar system project ideas?

      Q: What are some solar system project ideas?

      A: A popular solar system project idea is the construction of a solar system model. While the hanging Styrofoam ball model is an easy-to-create option, constructing the solar system in panoramic form in a shoe box can also be fun.
      See Full Answer
      Filed Under:
    • What did Galileo discover?

      Q: What did Galileo discover?

      A: After Galileo built his first telescope in 1609, he observed and described the landscape of the moon, discovered four of the moons of Jupiter, discovered the phases of Venus, and discovered sunspots. Galileo's discovery of sunspots supported the idea of heliocentrism, a model that places the sun at the center of the universe with the planets orbiting around it.
      See Full Answer
      Filed Under:
    • Is the sun bigger than the moon and Earth?

      Q: Is the sun bigger than the moon and Earth?

      A: The sun is bigger than both the moon and the Earth. The Earth is approximately 7,926 miles in diameter, while the sun is roughly 900,000 miles in diameter. The moon is smaller than both the sun and the Earth, with a diameter of 2,159.26 miles.
      See Full Answer
      Filed Under:
    • See More Astronomy Questions
    • How is body temperature controlled?

      Q: How is body temperature controlled?

      A: Body temperature is controlled through the process of thermoregulation, which allows the body to maintain a consistent temperature at its core. Homeostasis is the state which occurs when thermoregulation is successful.
      See Full Answer
      Filed Under:
    • What are the characteristics of multicellular organisms?

      Q: What are the characteristics of multicellular organisms?

      A: The defining characteristic of multicellular organisms is the possession of more than one cell. In order for a multicellular organism to function, its constituent cells must be capable of identifying and attaching to one another.
      See Full Answer
      Filed Under:
    • What is the importance of photosynthesis in life?

      Q: What is the importance of photosynthesis in life?

      A: Photosynthesis is the process that drives nearly all of the energy economies on Earth. It is the mechanism by which plants and green algae do the work of converting sunlight into an effective fuel for driving protein and carbohydrate synthesis. These biomolecules are then used by the plant for its own growth and reproduction.
      See Full Answer
      Filed Under:
    • How much water is required for corn to grow?

      Q: How much water is required for corn to grow?

      A: In order to obtain high crop yields, corn requires between 20 to 25 inches of water per growing season. A low yield can be obtained from 15 to 16 inches of water, but will depend on what part of the season the water is available. It takes 27,000 gallons to equal 1 inch of water per acre.
      See Full Answer
      Filed Under:
    • How do fungi obtain food?

      Q: How do fungi obtain food?

      A: Microbe World indicates that fungi absorb food from their immediate surroundings directly through their cell walls unlike animals, which eat food, and plants, which produce their own food through the process of photosynthesis. Kew Gardens adds that fungi function like an inside-out version of an animal's stomach. Instead of eating food and digesting it internally, fungi first dissolve food into simpler nutrients and then absorb the food after they digest it.
      See Full Answer
      Filed Under:
    • What are the 25 branches of biology?

      Q: What are the 25 branches of biology?

      A: Various branches used in biology include those pertaining to animals, evolution, the environment and chemistry. Branches covering microorganisms and microscopic structure are grouped together, as are subsections related to the medical field.
      See Full Answer
      Filed Under:
    • See More Biology Questions
    • What makes fireworks whistle?

      Q: What makes fireworks whistle?

      A: Whistling fireworks require two components: an explosive mixture that makes a sound when it burns and an empty portion of the rocket tube to act as a resonance chamber. The gas released creates the noise, while the chamber allows the sound waves to build on each other to earsplitting volume.
      See Full Answer
      Filed Under:
    • What is silicon dioxide?

      Q: What is silicon dioxide?

      A: Silicon dioxide, or silica, is a chemical compound that is the main component of sand, glass and quartz. By processing sand at high temperatures, glass is formed. Sand, and therefore glass, may also contain other minerals.
      See Full Answer
      Filed Under:
    • What are examples of mineral salts?

      Q: What are examples of mineral salts?

      A: Examples of mineral salts include sodium, calcium, ammonium phosphate, potassium, magnesium, chlorine, sulphur and phosphorus. Mineral salts are naturally occurring inorganic substances that are extracted from below the ground surface.
      See Full Answer
      Filed Under:
    • What is the most flammable substance in the world?

      Q: What is the most flammable substance in the world?

      A: The most flammable substance in the world is chlorine trifluoride, according to About.com. This substance is so flammable that it does not require an ignition source to combust.
      See Full Answer
      Filed Under:
    • What effect does iodine have on onion cells?

      Q: What effect does iodine have on onion cells?

      A: Iodine reacts with the starch present in onion cells, producing a coloration that makes the cells easily visible under a microscope. Onion cells are naturally transparent, so it is difficult to properly visualize them without using a solution to increase contrast.
      See Full Answer
      Filed Under:
    • What is the role of chemistry in society?

      Q: What is the role of chemistry in society?

      A: Chemistry is a broad scientific field, and its relevance is seen in almost every aspect of society, including medicine, cooking, environmental processes, cleaning and manufacturing goods. Class notes from the Department of Chemistry at Michigan State University state that the Chemical Age is one of the great three ages of the 20th century, the others being the Nuclear Age and the Electronic Age.
      See Full Answer
      Filed Under:
    • See More Chemistry Questions
    • What two colors make green?

      Q: What two colors make green?

      A: Combining blue and yellow creates green. However, the shade of green created is altered depending on the ratio of yellow to blue.
      See Full Answer
      Filed Under:
    • How do you make the color turquoise?

      Q: How do you make the color turquoise?

      A: To make the color turquoise, mix blue and green. The hue and saturation of turquoise depends on the ratios of blue and green used. To make a bright turquoise, use more green than blue. To make a manganese blue, which is between turquoise and teal, use more blue than green.
      See Full Answer
      Filed Under:
    • What colors do you mix to get turquoise?

      Q: What colors do you mix to get turquoise?

      A: The color turquoise is made when blue and green are mixed together. The color is named after the semiprecious stone of the same name, which is greenish blue in color.
      See Full Answer
      Filed Under:
    • Which two colors make turquoise?

      Q: Which two colors make turquoise?

      A: Turquoise cannot be made exactly from two colors because it is not on the color wheel; the two most prominent colors in turquoise are blue and green. There are many different shades of turquoise, with some being more greenish and others resembling a pale blue.
      See Full Answer
      Filed Under:
    • What color is ebony?

      Q: What color is ebony?

      A: Ebony is a very deep black derived from various tropical trees of the genus Diospyros. The wood comes from tropical and subtropical trees in southern India and Sri Lanka. The word "ebony" itself is commonly used as a synonym for the color black.
      See Full Answer
      Filed Under:
    • What is color intensity?

      Q: What is color intensity?

      A: Color intensity refers to how bright or dull a color looks, according to Art Studio Chalkboard. This term is most often used in art and photography but can also have other applications. Bright colors are considered more pure, while dull colors can appear indistinguishable or gray.
      See Full Answer
      Filed Under:
    • See More Colors Questions