Age dating crater counting facesdating


20-Jan-2016 19:03

The abstract states: The small crater populations (diameter smaller than 1 km) are widely used to date planetary surfaces.The reliability of small crater counts is tested by counting small craters at several young and old lunar surfaces, including Mare Nubium and craters Alphonsus, Tycho and Giordano Bruno.For example a surface may be covered by a few hundred meters of mobile sand dunes; the numbers of craters of diameter D and depth d would give a mean characteristic age of topographic features of the scale of D,d.Smaller craters in mobile dunes would disappear faster and have lower mean ages.Astronomers had hoped that secondaries could be identified, thereby alleviating the confusion.Not so; a new paper in indicates that many secondaries are very difficult to distinguish from primaries, because debris lofted up may go into orbit for years, falling down far away from the initial impact (distant secondaries).

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Or that the surface of the moon Io is younger than 50 years?Its underlying assumption, unquestioned for decades, has recently been found to be seriously flawed.



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Added)); USE [master] GO CREATE DATABASE [My School] GO USE [My School] GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TABLE [dbo].[Course]([Course ID] [nvarchar](10) NOT NULL, [Year] [smallint] NOT NULL, [Title] [nvarchar](100) NOT NULL, [Credits] [int] NOT NULL, [Department ID] [int] NOT NULL, CONSTRAINT [PK_Course] PRIMARY KEY CLUSTERED ( [Course ID] ASC, [Year] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY] GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TABLE [dbo].[Department]([Department ID] [int] IDENTITY(1,1) NOT NULL, [Name] [nvarchar](50) NOT NULL, [Budget] [money] NOT NULL, [Start Date] [datetime] NOT NULL, [Administrator] [int] NULL, CONSTRAINT [PK_Department] PRIMARY KEY CLUSTERED ( [Department ID] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY] GO INSERT [dbo].[Course] ([Course ID], [Year], [Title], [Credits], [Department ID]) VALUES (N' C1045', 2012, N' Calculus', 4, 7) INSERT [dbo].[Course] ([Course ID], [Year], [Title], [Credits], [Department ID]) VALUES (N' C1061', 2012, N' Physics', 4, 1) INSERT [dbo].[Course] ([Course ID], [Year], [Title], [Credits], [Department ID]) VALUES (N' C2021', 2012, N' Composition', 3, 2) INSERT [dbo].[Course] ([Course ID], [Year], [Title], [Credits], [Department ID]) VALUES (N' C2042', 2012, N' Literature', 4, 2) SET IDENTITY_INSERT [dbo].[Department] ON INSERT [dbo].[Department] ([Department ID], [Name], [Budget], [Start Date], [Administrator]) VALUES (1, N' Engineering', 350000.0000, CAST(0x0000999C00000000 AS Date Time), 2) INSERT [dbo].[Department] ([Department ID], [Name], [Budget], [Start Date], [Administrator]) VALUES (2, N' English', 120000.0000, CAST(0x0000999C00000000 AS Date Time), 6) INSERT [dbo].[Department] ([Department ID], [Name], [Budget], [Start Date], [Administrator]) VALUES (4, N' Economics', 200000.0000, CAST(0x0000999C00000000 AS Date Time), 4) INSERT [dbo].[Department] ([Department ID], [Name], [Budget], [Start Date], [Administrator]) VALUES (7, N' Mathematics', 250024.0000, CAST(0x0000999C00000000 AS Date Time), 3) SET IDENTITY_INSERT [dbo].[Department] OFF ALTER TABLE [dbo].[Course] WITH CHECK ADD CONSTRAINT [FK_Course_Department] FOREIGN KEY([Department ID]) REFERENCES [dbo].[Department] ([Department ID]) GO ALTER TABLE [dbo].[Course] CHECK CONSTRAINT [FK_Course_Department] GO using System; using System. … continue reading »


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