Fast Radio Bursts
Millisecond-long pulses of radio energy from deep space, whose origins remain unknown, with theories ranging from neutron stars to extraterrestrial intelligence.
OVERVIEW
Fast Radio Bursts (FRBs) are intense, millisecond-long pulses of radio energy detected from deep space. The first FRB was discovered in 2007 by Duncan Lorimer and his student David Narkevic in archival data from the Parkes Observatory. Since then, hundreds of FRBs have been detected. Most are one-off events, but some repeat. The first repeating FRB (FRB 121102) was traced to a dwarf galaxy 3 billion light-years away. Theories for FRB origins include magnetars (highly magnetized neutron stars), neutron star mergers, and — speculatively — extraterrestrial intelligence. In 2020, an FRB was detected from within the Milky Way, confirming magnetars as one source. However, the full range of FRB origins remains unknown.
KNOWN FACTS
FRBs produce energy equivalent to the sun's annual output in milliseconds
The repeating FRB 121102 has been traced to a specific galaxy
The dispersion measures of FRBs confirm they originate from outside the Milky Way
A 2020 FRB from within the Milky Way confirmed magnetars as one source
The CHIME observatory detects multiple FRBs daily, enabling statistical analysis
CLAIMS
FRBs could be signals from extraterrestrial intelligence (ETI)
The repeating FRBs suggest an artificial origin
FRBs could be evidence of alien technology (light sails, power beams)
The energy output of FRBs is too high for natural explanations
FRBs are a new phenomenon that could revolutionize physics
EVIDENCE FOR
FRBs produce energy equivalent to the sun's annual output in milliseconds
The repeating FRB 121102 has been traced to a specific galaxy
The dispersion measures of FRBs confirm they originate from outside the Milky Way
A 2020 FRB from within the Milky Way confirmed magnetars as one source
The CHIME observatory detects multiple FRBs daily, enabling statistical analysis
EVIDENCE AGAINST
The energy required for artificial FRBs would be astronomical and impractical
Magnetars have been confirmed as a natural source for at least some FRBs
The lack of modulation or information content argues against ETI origin
FRB rates are consistent with known astrophysical phenomena (magnetar flares)
The ETI hypothesis is a speculation of last resort, not a leading theory
OPEN QUESTIONS
No open questions recorded.
SOURCES
TIMELINE
First FRB discovered in archival Parkes data
First repeating FRB (FRB 121102) discovered
FRB 121102 traced to a dwarf galaxy 3 billion light-years away
FRB detected from within the Milky Way, confirming magnetar origin