Combining observations in gravitational waves with those from
more conventional telescopes can help tease out details of how these processes happen.
That will enable us to pinpoint the source of gravitational waves in the sky, so
more conventional telescopes can follow up and check for a visible counterpart to the signal.
Many people find dark matter's existence very strange and ask how it can possibly be that most matter — about six times the amount we see — is something we can't detect
with conventional telescopes.
When the gravitational wave event GW170817 was detected, astronomers rushed to search for the source
using conventional telescopes (see the Introduction by Smith).
There are thought to be loads of exoplanets out there, but a few of them are too small and too distant from their host stars to be detected
by conventional telescopes.
Simultaneously «seeing» a neutron - star collision
with conventional telescopes and «hearing» it through the vibrations of gravitational waves would mark a new era of astronomy.
So if, say, LIGO and Virgo were to detect gravitational waves from a cosmic event, and find that the waves took slightly longer to arrive at Earth than the associated burst of γ - rays detected by a
more conventional telescope, that could have momentous consequences for fundamental physics.
In the past few years, she and others have started to see some of the missing matter: hidden pockets of extremely cold matter all but invisible to
conventional telescopes.
Eighty per cent of the total matter in the cosmos is invisible to
conventional telescopes.
With their long strings of light - detecting devices, lowered into deep water or ice to wait for the telltale flashes that signal a neutrino, none of them looks remotely like
a conventional telescope.
The remaining 80 per cent is mysterious «dark matter», invisible to
conventional telescopes.
Whereas
a conventional telescope commonly has a mirror or lens shaped like a parabola to concentrate the light it gathers onto a point, the lens at Haystack is a 6 - foot - high stack of computers.
In contrast,
a conventional telescope's whole structure moves to track its targets.
«
Conventional telescopes would have had only a data point or two and missed it.»
These direct observations tantalized astronomers because, with only two detectors, it was impossible to narrow down the location of the sources so that
conventional telescopes could learn more about them.
In
a conventional telescope with a secondary obstructing the primary and with support «spiders», the diffraction off these spiders gives a much higher background than either diffraction or roughness at large angular separations.