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JBIS, Vol. 69, pp.?-?, 2016

ET PROBES: LOOKING HERE AS WELL AS THERE

Foundation for Investing in Research on SETI Science and

Technology (FIRSST), Berkeley, California.

JOHN GERTZ

Zorro Productions, 125 University Avenue, Suite 101, Berkeley, CA 94710, USA. 1.

INTRODUCTION

extra-terrestrial radio transmissions in 1960 [1], there have been many such searches [2, 3, 4]. Almost all have been to Earth from solar or terrestrial orbits, or from the surface communication streams, or to detect signals that are 2.

WHY SEND PROBES?

2.1

Reasons

• Cost • Time: Probes are launched once (one and done);

Keywords:

Probes, SETI, ET, Altruism, Asteroids

continuously over millions or even billions of years. : If Earth is the only biologically list of targets of interest to ET, and ET's home star is just • Labour: maintenance of one or more gargantuan transmitters. • Raw materials transmitter. • Energy: The energy required to accelerate to only of years. 2.2 Speed could take an arbitrarily long time to arrive, and hence the 2.3

Energetics

should be vastly less than the energy required to transmit using immense energy merely to attract our attention, a beacon messages to travel back and forth across the Galaxy. receiving technology. 2.4

The L Factor

L factor in the Drake

equation, namely the length of time that a civilization broadcasts either because it has lost interest, has self-destructed or has information bundle to our younger civilization. By sending 2.5

It is Safer for ET to Send Probes

receiving civilization might be hostile, and be authorized to give out its return address only in the event that a threat is not 2.6

Probes as Life Forms

It is an oft-stated thesis of SETI scientists that ET is much more be silicon rather than carbon based [15]. In effect, a biological 3.

WHERE TO LOOK

3.1 Earth in sediment, subducted, inundated, covered by lava or glaciers, of search, it should be by geologists or archeologists, and not by astronomers. Additionally, the machinery needed to affect object such as the Earth might add deleteriously to the size and 3.2

Lagrange Points

asteroid, but that system need be engineered to be used just once. 3.3 Moons in the Solar System may have a better assortment of useful materials near their surfaces, but many have active geologies 3.4

Oort Cloud and Kuiper Belt

3.5

Asteroids

trigger its beaconing behavior. Therefore, the author believes that 4.

WHAT TO LOOK FOR

(e.g., <10W) radio beacon. At some frequency or frequencies, also require shielding, a guidance system, sensors, deceleration but smaller than an automobile. 5.

PROBES MAY BE PLENTIFUL

5.1

Multiple Civilizations

L is quite

numerous than interstellar beacons. 5.2

Sequential Versions

sequentially, as versions 1.0, 2.0, 3.0, etc., each informing us of say, 200 years ago, informing our galactic neighbors of the great 5.3

Replication upon Arrival

6.

IF PLENTIFUL, WOULD PROBES

BE EASY TO FIND?

one. By contrast, interstellar beacons may cycle sequentially of targets. detection, making their discovery by any current technology 7.

WHAT'S IN IT FOR ET?

a priori of years. What's in it for ET under these circumstances? transmissions, there can be commerce, albeit, delayed by the something like this: ET might transmit an abridged version of

Close Encounters of the Third Kind,

a priori, that Solar System. In fact, they could demand this in exchange for far reaches of the Earth, and in great discomfort, to transmit their not require a sustained millions or billions of year's dedication

L may be the great motivator. Any

8.

CONCLUSIONS

Physics Today, 14

Confessions of an Alien Hunter: A Scientist's Search for

Extraterrestrial Intelligence

Contact with Alien Civilizations: Our Hopes and Fears about Encountering Extraterrestrials Cosmic Company: The Search for Life in the Universe The Galactic Club: Intelligent Life in Outer Space

Astronautics and Aeronautics, 11

JBIS, 33

JBIS, 33,

Nature, 431,

the background, and far more still if the selected asteroids some additional shifts in search strategies. Signal detection astronomers record a transient signal in their data that cannot the coordinates of the asteroid's then current location. Such at least for the duration of the average rotation rate of similar objects. (Received 19 May 2016; Accepted 14 June 2016) * * *REFERENCES

Existence

Astrobiology, 10

Astrobiology, 10

Confessions of an Alien Hunter

Theory of Self-Reproducing Automata

A. Jl R. astr. Soc., 24

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