The K-T Boundary Event happened about 65 million years ago when an asteroid the size of Deimos struck the ________ Peninsula
Fill in the blank(s) with correct word
Yucatan
You might also like to view...
The NGC (New General Catalog) is a compilation started by Herschel, and lists galaxies and other astronomical objects.
Answer the following statement true (T) or false (F)
How did astronomers discover the relationship between spectral type and mass for main sequence stars?
A) by measuring stellar radii with very powerful telescopes B) by measuring the masses and spectral types of main-sequence stars in binary systems C) by using computer models of hydrogen fusion and stellar structure D) by comparing stars with the same spectral type but different luminosities
Significant Figures: What is 
expressed to the correct number of significant figures?
Fill in the blank(s) with the appropriate word(s).
What is this a picture of?
A) a total solar eclipse B) a total lunar eclipse C) the saros cycle D) a full moon