A NASA experiment called ANITA (Antarctic Impulsive Transient Antenna) has recorded strange radio signals that emanate when ultra-energetic cosmic rays collide with Earth's atmosphere. The device, mounted on a giant balloon that flies over Antarctica to avoid ground-based interference, has detected radio waves rising from below, a phenomenon that has scientists baffled.
These unusual signals were recorded at deep angles – about 30° below the horizon – which does not fit the typical pattern of cosmic rays crashing into the atmosphere and producing soft waves. What’s more, they appear to emerge from deep within the Earth, as a particle would have to travel over 3,000 miles of rock to emerge on the other side – something no known particle can do.
"The problem is that we don't yet have a real explanation for these anomalies, but we know that they are most likely not neutrinos," said Stephanie Wissel, a professor of physics and astrophysics who is analyzing the ANITA data.
Neutrinos, which pass through matter without stopping, are one possible explanation, but the intensity and angle of the pulses defy even the most advanced theories. Millions of neutrinos pass through our bodies every second without leaving a trace, so detecting one would mean a long journey through the universe, perhaps from its edge, writes A2 CNN.
Scientists will have more answers in December, when a new device – PUEO – will make its first flight over Antarctica. Equipped with more antennas and more sensitive electronics, it is expected to improve sensitivity to these signals fivefold. (A2 Televizion)
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