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What is a light-year and how is it used?? - NASA Answer: A light-year is a unit of distance It is the distance that light can travel in one year Light moves at a velocity of about 300,000 kilometers (km) each second So in one year, it can travel about 10 trillion km More p recisely, one light-year is equal to 9,500,000,000,000 kilometers
What is a light-year and how is it used?? - NASA A light-year is a unit of distance It is the distance that light can travel in one year Light moves at a velocity of about 300,000 kilometers (km) each second So in one year, it can travel about 10 trillion km More p recisely, one light-year is equal to 9,500,000,000,000 kilometers
Just How Big is this Place - NASA This activity can be used in conjunction with the StarChild Universe Level 2 information OBJECTIVES: Examine ways of measuring distance Make inferences regarding space travel Identify the distance relationship between Earth and other objects in the Universe Develop formulas and procedures for determining measurements to solve problems Chose the appropriate metrics units and tools Calculate
StarChild: Glossary - NASA A ACCREDITED An educational institution which has been recognized as maintaining standards that qualify graduates for admission to higher, or more specialized, institutions or professional practice
StarChild: Galaxies - NASA A galaxy contains stars, gas, and dust which are held together as a group by gravity There may be millions, or even billions, of stars in one galaxy There are billions of galaxies in the universe Galaxies are labeled according to their shape Some galaxies are called "spiral", because they look like giant pinwheels in the sky The galaxy we live in, the Milky Way, is a spiral galaxy Some
StarChild: The Solar System - NASA The words " solar system " refer to the Sun and all of the objects that travel around it These objects include planets, natural satellites such as the Moon, the asteroid belt, comets, and meteoroids Our solar system has an elliptical shape and is part of a galaxy known as the Milky Way The Sun is the center of the solar system It contains 99 8% of all of the mass in our solar system
StarChild: The Milky Way - NASA Our Sun is a star in the Milky Way Galaxy If you were looking down on the Milky Way, it would look like a large pinwheel rotating in space Our Galaxy is a spiral galaxy that formed approximately 14 billion years ago Contained in the Milky Way are stars, clouds of dust and gas called nebulae, planets, and asteroids Stars, dust, and gas fan out from the center of the Galaxy in long spiraling
Supernovae - NASA Supernovae At large distances (up to about 1 billion light-years), astronomers can no longer use methods such as parallax or Cepheid variables At such large distances, the parallax shift becomes too small and we can no longer even see individual stars in galaxies Astronomers then turn to a series of methods that use "standard candles", that is, objects whose absolute magnitude is thought to