Cosmic Drops: How Gravity Revealed Four New Cold Giants
Original: "Four Cold Giant Planets Discovered by High-Cadence Microlensing Surveys"
Four new giant worlds discovered in the Galactic bulge thanks to sudden flashes of light — gravitational microlensing.
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A raindrop on a windowpane momentarily magnifies a distant glimmer. In space, gravity plays the same role: passing in front of a background star, an invisible planet bends the light and makes it flare up. That's how four icy giants were discovered right in the center of the Galaxy — where stellar crowding breeds wonders. Future telescopes will turn this drizzle of light into a true downpour of discoveries.
🎯 During microlensing, a star's brightness can increase a hundredfold, but each event is unique — there will never be a repeat.
\theta_{\rm E} = \sqrt{\kappa M \pi_{\rm rel}}, \quad \kappa = \frac{4G}{c^2\,{\rm au}} \approx 8.144~{\rm mas}\,M_\odot^{-1}
θE is the angular Einstein ring radius; κ is a constant involving the speed of light; the more massive the lens, the larger the radius.
q = M_{\rm p} / M_*
q is a dimensionless quantity; for giant planets around low-mass stars, it lies in the range 10⁻³.
Scientists
Alan GuthAndrei LindeGeorges LemaîtreJames PeeblesAdam RiessBrian Schmidttransit method
Hubble Space Telescope
speed of light
spectroscopy
hydrogen
gravitational waves
dark matter
black hole
big bangLaws
Friedmann equationsHubble's lawDoppler effectHawking radiationgravitational lensingprinciple of constancy of the speed of light