Back to Home

Blackholes Forum Message

Forums: Atm · Astrophotography · Blackholes · Blackholes2 · CCD · Celestron · Domes · Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem
RSS Button

Home | Discussion Forums | Blackholes I | Post

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Just Physics.

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Alexander on September 17, 2001 17:59:43 UTC

Moon is slowly receeding from Earth (a couple inches a year as verified by laser and radar probing). Thus, the Moon was closer to Earth(likely 2-3 times closer) when it was born (time of which is estimated to be about 4 billion years ago, shortly after Earth clumped out of space protoplanetary dust/rock ring).

Because Moon's composition is of double origin (there are Earth minerals there, and completely foreign to Earth ones), it is believed to originate in a collision of Earth with another planet, after which Earth was surrounded by equatorial rings of debrie from both. With time rings coalesce into what we now call Moon. This collision also believed to give Earth the 23 degree tilt which gives us seasons, and probably some ellipticity of orbit. Magnitude of collision erazed any life forms existing before it (if any) and probably melted young Earth's crust again completely.

Computer simulations also support this "catastrophic creation of Moon" hypothesis.

Follow Ups:

    Login to Post
    Additional Information
    About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
    Unless otherwise specified, web site content Copyright 1994-2024 John Huggins All Rights Reserved
    Forum posts are Copyright their authors as specified in the heading above the post.
    "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET"
    are trademarks of John Huggins