WHAT if a lighthouse looked as bright from 100 kilometres as it did from 100
metres? Strange as it may sound, an astrophysicist is claiming beacons like this
exist in the Universe in the form of X-ray-emitting jets emerging from
quasars.
Common sense says that galaxies and stars should appear fainter the farther
away they are, which is why astronomers build ever more powerful telescopes.
But Dan Schwartz of the Harvard-Smithsonian Center for Astrophysics believes
X-ray jets from quasars look just as bright no matter how far away they are.
This makes them unique cosmic probes which may allow astronomers…
