You searched for: “year”
Traffic Safety Considerations
(in 1946, an eighteen-year-old San Diego High School student wrote an essay in which he asked for plain courtesy when driving)
Word Entries containing the term: “year”
cosmic year
The time it takes the sun to travel around the center of the galaxy, roughly 22.5 million years.
This entry is located in the following unit: Astronomy and related astronomical terms (page 7)
light-year, light-years; light year, light years
The distance traveled by a beam of light in a vacuum in one year, approximately 9.46 trillion (million million) kilometers or 5.99 trillion miles.

An an average speed of 186,291 miles or 299,792 kilometers, per second; which equals approximately 5.88 trillion miles or 9.4607 trillion kilometers, or 63,246 astronomical units.

The light-year is also divided into light-minutes and light-seconds; for example, the moon is 1.3 light-seconds from the earth; the sun is 8.3 light-minutes away from the earth.

Although a light-year is a measurement of distance and not time, it does imply time; such as, the light from a star that is ten light-years from the earth takes ten years to reach the earth; so, an observer on earth is seeing the star as it appeared ten years ago.

This entry is located in the following units: Astronomy and related astronomical terms (page 14) Measurements and Mathematics Terms (page 7)
McGraw-Hill Year Book of Science & Technology
McGraw-Hill, Inc.; New York; 1992.
This entry is located in the following unit: Sources of Information; Science and Technology (page 1)
The 106-year-old Virginia McLaurin, an African-American, was very excited to meet the Obamas in the White House and she was dancing with joy.

Ms. McLaurin was invited as part of a Black History Month celebration. “I thought I would never live to get into the White House and I tell you I am so happy to have a black president,” she said to the smiling Barack Obama and the first lady, Michelle Obama.

Click on this link: to see the video posted by the White House as Virginia McLaurin opens her arms wide and greets Obama with an excited "Hi!".

This entry is located in the following unit: Videos (page 1)