Tagged Questions
1
vote
2answers
44 views
Locating a Comet, how is it done?
How are the comet-hunters able to precisely locate/know about the required comets ? How can they distinguish between comets from such a far distance ? How are they able to estimate the exact time ...
2
votes
2answers
273 views
Parabolic or Hyperbolic?
How can astronomers find the difference between a parabolic and a hyperbolic comet ? What are the criteria that helps them distinguish these ? Can a parabolic comet switch over to become a hyperbolic ...
0
votes
0answers
22 views
Expansion of Universe [duplicate]
Possible Duplicate:
Why space expansion affects matter?
If the Expansion is prevalent, i.e. it is observable and true then shouldn't that result in the expansion of the Milky Way galaxy, ...
1
vote
1answer
102 views
Earth's beginnings and early years, Re radioactive decay or not
It is said that the Earth and solar system are 4.6 billion years old.
Presumably this date is achieved from radioactive decay.
If this is the case, since most of the radioactive elements would have, ...
