A Lagrange point in the Earth-Moon system is a position
On the Earth's surface that the Moon's gravity is concentrated
on the surface of the Moon that points directly away from the Earth
In space where the effects of the Earth's and Moon's gravity cancel each other out
Directly between the Earth and Moon
An optical SETI signal would most likely consist of
Using mirrors to reflect light from the surface of a planet
using a giant disk to block out the light from the parent star
A continuous beam of laser light
rapid, short bursts of intense laser light
An organism with an Encephalization Quotient (EQ) of 4 is expected to be of
Lowest possible intelligence
Any reply to a detected SETI signal should
Represent a consensus of the Earth's population
Be decided upon by the group of scientists who first detected the signal
Be decided upon by the government of the country who first detected the signal
Be sent immediately as a signal is received
If we were to intercept a signal from a civilization that was sent to another of its colonies on the other side of the galaxy, this would be an example of
an intentional signal beacon
A signal used for communication between a civilization's home world and another planet in its own planetary system
A signal used for communication between a civilization's home world and another star system
a signal used for local communication the world where the intelligent beings exist
In 1974 we transmitted a message toward the globular cluster M13 which is 21,000 ly away. What is one reason that this object was probably not ideal for sending a message to?
it is so far away that we will probably have stopped communicating before we receive and return signal
The message will be absorbed by interstellar dust before it reaches the cluster
Globular clusters contain, old, low mass stars with fewer heavy elements and hence are not ideal places for life
Globular clusters contain young, high mass stars with insufficiently long main sequence lifetimes and hence are unsuitable places for life
Intelligence may be subject to convergent evolution because it
Is a fundamental characteristic of life
Sending signals at optical wavelengths might be a viable alternative to radio wavelengths
over relatively short distances where absorption by interstellar matter would not be a problem
over all distances as long as the intensity of the signal is strong enough
Only between civilizations around solar-type stars whose eyes have evolved to see such radiation
As long as the light transmitted is a different color than the light given off by the parent star
The 1420 MHz (21 cm) radio line generated by neutral hydrogen atoms is a good choice for interstellar communications because
it is the easiest radio frequency to generate
it is the only frequency to which radio telescopes can be tuned
all intelligent civilizations should be aware of its universal significance and would probably also think of sending and receiving signals at this frequency
It is the only radio frequency that is not blocked by interstellar matter
The adoption of very similar streamlined body shapes by both sharks and dolphins provides evidence for
Life originating in the oceans
The Declaration of Principles Concerning Activities Following the Detection of Extraterrestrial Intelligence states that the first thing to do after the detection of a possible signal is to
Announce the discovery to the public
Confirm that it is genuine
The Drake equation allows us to estimate the number of
intelligent civilizations that have existed in our galaxy during its entire lifetime
intelligent civilizations capable of communicating in our galaxy now
Intelligent civilizations capable of traveling to the Earth
Habitable planets on which life has arisen
The fact that Encephalization Quotients (EQs) of organisms have generally increased with time provides evidence for
