The giant impact hypothesis—the favored scientific hypothesis for the formation of the Moon—proposes that the Moon was created from the debris of a collision between a young Earth and a Mars-sized celestial body. Evidence for the hypothesis includes Moon samples indicating that its surface was once molten, the Moon's apparently relatively small iron core and lower density than that of Earth, and evidence of similar collisions in other solar systems. What evidence is inconsistent with the theory?
(They taught me all I knew);
Their names are What and Why and When
And How and Where and Who.
Back in the day
Shakespeare penned 154 sonnets in his lifetime. Likely written sometime in the 1590s, the majority of the poems were first published in a 1609 work titled Shake-Speares Sonnets. The first 126 of the 154 sonnets are addressed to a young man whose identity has long intrigued scholars. The publisher, Thomas Thorpe, wrote a dedication to the first edition in which he claimed that a person with the initials WH had inspired the sonnets. What are some theories about who the man might have been?
Born on a day like today
Dolley Madison was the wife of US President James Madison, whom she married in 1794, after the death of her first husband. Noted for her magnificence as a hostess as well as for her charm, Dolley was an extremely popular first lady and was a great asset to Madison's political career. During the War of 1812, she saved many state papers and a portrait of George Washington from the advancing British soldiers. Why did she perform the duties of the first lady during Thomas Jefferson's administration?