Question and answer
Describe the “big splash” theory of the Moon’s origin
The giant impact hypothesis (Big Splash) states that the Moon was formed out of the debris left over from a collision between the Earth and a body the size of Mars, approximately 4.5 Gya (four and a half billion years) ago. [ The colliding body is sometimes called Theia, for the mythical Greek Titan who was the mother of Selene, the goddess of the Moon.[1][2] The giant impact hypothesis is the
currently-favoured scientific hypothesis for the formation of the Moon.[3] Supporting evidence includes: the Earth's spin and Moon's orbit having similar orientations,[4] Moon samples indicating the surface of the Moon was once molten, the Moon's relatively small iron core, lower density compared to the Earth, evidence of similar collisions in other star systems (that result in debris disks), and that giant collisions are consistent with the leading theories of the formation of the solar system. Finally, the stable isotope ratios of lunar and terrestrial rock are identical, implying a common origin.[5] There remain several questions concerning the best current models of the giant impact hypothesis, however. The energy of such a giant impact is predicted to heat Earth to produce a global 'ocean' of magma; yet there is no evidence of the resultant planetary differentiation of the heavier material sinking into Earth's mantle. At present, there is no self-consistent model that starts with the giant impact event and follows the evolution of the debris into a single moon. Other remaining questions include when the Moon lost its share of volatile elements and why Venus, which also experienced giant impacts during its formation, does not host a similar moon. Answer found on: ]
Expert answered|hellphoenix|Points 69|
Question|Rated good
Asked 7/16/2013 12:13:34 PM
0 Answers/Comments
Get an answer
New answers
Rating

There are no new answers.

Comments

There are no comments.

Add an answer or comment
Log in or sign up first.
Questions asked by the same visitor
What elements make up the Earth’s mantle User: What is Earth’s mantle
Weegy: The Earth's mantle is a roughly 1,800 mile (2,900 km) thick shell of compressed and heated rock, beginning below the Earth's crust (lithosphere), [ which extends 3.1 miles (5 km) below the ocean floor and 19 to 31 miles (30 to 50 km) below the continents. Read more ] (More)
Question
Expert Answered
Asked 7/16/2013 12:10:18 PM
0 Answers/Comments
23,863,590 questions answered
Popular Conversations
Which word has a more negative connotation for the sentence ...
Weegy: We bought __________________ souvenirs at the amusement park: a. inexpensive. User: The dictionary meaning ...
2/7/2016 8:01:03 AM| 3 Answers
Both species benefit in the type of symbiosis called parasitism.
Weegy: Both species benefit in the type of symbiosis called parasitism. FALSE. User: Mutualism, commensalism, and ...
2/7/2016 9:25:53 AM| 3 Answers
You don't really approve of the idea of political parties. However, ...
Weegy: You don't really approve of the idea of political parties. However, you're known as a Federalist and are soon ...
2/7/2016 1:00:15 AM| 2 Answers
An organism’s particular role in its habitat, or how it makes its ...
Weegy: An organism's particular role in its habitat, or how it makes its living, is called its niche. User: An ...
2/7/2016 9:17:59 AM| 2 Answers
Weegy Stuff
S
Points 225 [Total 622] Ratings 0 Comments 225 Invitations 0 Offline
S
P
P
Points 152 [Total 959] Ratings 0 Comments 152 Invitations 0 Offline
S
1
L
L
P
R
P
L
P
Points 106 [Total 11279] Ratings 0 Comments 106 Invitations 0 Offline
S
L
P
Points 46 [Total 2114] Ratings 0 Comments 46 Invitations 0 Offline
S
Points 4 [Total 904] Ratings 0 Comments 4 Invitations 0 Offline
S
Points 4 [Total 4] Ratings 0 Comments 4 Invitations 0 Offline
S
R
Points 2 [Total 438] Ratings 0 Comments 2 Invitations 0 Offline
S
Points 2 [Total 2] Ratings 0 Comments 2 Invitations 0 Offline
S
Points 1 [Total 2] Ratings 0 Comments 1 Invitations 0 Offline
S
Points 1 [Total 2] Ratings 0 Comments 1 Invitations 0 Offline
* Excludes moderators and previous
winners (Include)