Tag Archives: astronomy

12 Possible Reasons We Haven’t Found Aliens

In 1950, a learned lunchtime conversation set the stage for decades of astronomical exploration. Physicist Enrico Fermi submitted to his colleagues around the table a couple contentions, summarized as 1) The galaxy is very old and very large, with hundreds of billions of stars and likely even more habitable planets. 2) That means there should be more than enough time for advanced civilizations to develop and flourish across the galaxy.

So where the heck are they?

This simple, yet powerful argument became known as the Fermi Paradox, and it still boggles many sage minds today. Aliens should be common, yet there is no convincing evidence that they exist.

Here are twelve possible reasons why this is so.

1. There aren’t any aliens to find. As unlikely as it seems in a galaxy with hundreds of billions of stars and as many as 40 billion Earth-size planets in habitable zones, we could be alone.

2. There is no intelligent life besides us. (This assumes, of course, that humans count as intelligent.) Life may exist, but it could simply take the form of miniscule microbes or other cosmically “quiet” animals.

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A Chronology of Mars Exploration

No name (retroactively named Marsnik 1)(Mars 1960A) – 480 kg – USSR Mars Probe – (October 10, 1960)

  • Failed to reach Earth orbit.

No name (retroactively named Marsnik 2)(Mars 1960B) – 480 kg – USSR Mars Probe – (October 14, 1960)

  • Failed to reach Earth orbit.

Sputnik 22 (Mars 1962A) – USSR Mars Flyby – 900 kg – (October 24, 1962)

  • Spacecraft failed to leave Earth orbit after the final rocketstage exploded.

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“A Grand Design for Dark Matter” – Trinh Manh Do

Good morning! Today we are going to investigate Dark Energy or generally visible matter, radiation. Even many theoretical models describing dark matter have been persuasively demonstrated, dark matter has not been detected directly, making it become one of the greatest mysteries in our cosmos.

Dark matter is invisible. Based on the effect of gravitational lensing, a ring of dark matter has been inferred in this image of a galaxy cluster CL0024+17 and has been represented in blue color.

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