Here is a concise summary of the provided text:
**Title:** Potential Alien Signal Detection by China's Sky Eye Radio Telescope
**Key Points:**
1. **Report and Removal**: A state-sponsored Chinese newspaper reported that the Sky Eye radio telescope (FAST) may have detected signals from an alien civilization, but the report was later removed.
2. **Signal Detection**: Scientist Zhang Tonjie mentioned that unusual, narrowband electromagnetic signals were detected, differing from previous captures, and would be investigated further.
3. **Telescope Capabilities**: FAST, the world's largest radio telescope, is 500m in diameter, 3 times more sensitive than its predecessor, and can focus on targets 40° away from its axis.
4. **Signal Nature**: Experts, including Dan Werthimer (UC Berkeley), believe the signals are likely due to **Radio Frequency Interference (RFI)**, not an extraterrestrial civilization.
5. **Challenges in SETI Research**: Radio pollution on Earth makes it increasingly difficult to conduct SETI (Search for Extraterrestrial Intelligence) research, potentially requiring future antennas to be placed in more isolated locations, like the Moon.
6. **Future Prospects**: Despite challenges, the ongoing space race among countries like China, Australia, and the USA may lead to significant discoveries in the search for extraterrestrial life within the next 10-30 years.
Here are the key facts extracted from the text, each numbered and in short sentence form, excluding opinions:
**Telescope and Location**
1. The Five hundred meter Aperture Spherical Telescope (FAST) is located in southwest China.
2. FAST is 500 meters (1640 feet) in diameter, half a kilometer (0.31 miles) across.
3. The telescope is situated in a natural pit made of limestone, 18 km (11.1 miles) from the nearest settlement.
**Design and Capabilities**
4. FAST is formed by combining 4450 different triangular aluminum panels.
5. The telescope has 2250 computer-controlled motors to adjust its position.
6. It can focus on targets 40° away from its axis, despite Earth's rotation.
7. FAST is three times more sensitive than the 300-meter Arecibo Telescope.
**Scientific Tasks and Discoveries**
8. FAST aims to map neutral hydrogen gas in the Milky Way Galaxy at high resolution.
9. It observes pulsars and has discovered over 100 pulsars during its testing phase.
10. FAST is tasked with detecting molecules in interstellar space and searching for extraterrestrial intelligence (SETI).
11. It looks for "repetitive fast radio burst" (FRB) signals as part of its SETI mission.
**Signal Detection and Interference**
12. The signals FAST detects are extremely weak, 1000 times weaker than a cell phone signal from the Moon.
13. A "radio silence" zone with a 5-kilometer diameter has been established around FAST to minimize interference.
14. Electronic devices like mobile phones and computers are forbidden within this zone.
**Related Research and Community**
15. Dan Werthimer, a SETI researcher from UC Berkeley, stated that the FAST signals are from radio interference, not an advanced civilization.
16. The Parkes radio telescope in Australia previously detected similar signals (later named "Peryton") that were caused by a microwave oven.
17. China has invited the international scientific community to work on FAST.