One light-year is the distance light travels in one year. The speed of light is about 300,000 km/s . How far is 1 light-year?
A) 1.08 billion km (1,080,000,000, or 1.08 109 km)
B) 300 thousand km (300,000, or 3 105 km)
C) 9.46 trillion km (9,460,000,000,000, or 9.46 1012 km)
D) 18 million km (18,000,000, or 1.8 107 km)
Question 2
What eventually halts the gravitational collapse of an interstellar gas cloud that forms an object that is massive enough to become a star?
A) the central object becoming hot enough to sustain nuclear fusion in its core
B) a critical fraction of the gas has been driven further into space
C) nothing; all collapsing gas clouds become black holes
D) the crowding of electrons in the core
Spinnbarkeit is the ability of cervical mucus to stretch a distance before breaking.
Examples of cell-to-cell communication based on the distance between cells
(A) Scratch test; patient is exposed to allergens through a light scratch on the skin; (B) Positive
Rate of Residential Change, Past Year, in the United States
J. M. W. Turner, Rain, Steam, and Speed—The Great Western Railway.
The distance between the centerline of the main bearing journal and the centerline of the ...