Planets with
extremely tight orbits offer scientists a wealth of data: For instance, each week Kepler 78b circles its star about 20 times, giving researchers numerous opportunities to observe its behavior.
(Many worlds that reside in
extremely tight orbits have been found by indirect means; it is the temperate, so - called Goldilocks zone where Earth analogues might be found that has proved most elusive.)
The group, led by physics professor emeritus Saul Rappaport, determined that in order for the planet to maintain
its extremely tight orbit around its star, it would have to be incredibly dense, made almost entirely of iron — otherwise, the immense tidal forces from the nearby star would rip the planet to pieces.
The planet zips around its host star every 8.5 hours in
an extremely tight orbit, and its daytime temperatures probably top 2,000 ° Celsius.
Not exact matches
But the current exoplanet catalogue primarily reflects the low - hanging fruit —
extremely large planets in
tight orbits, whose visible or gravitational effects on their stars are more pronounced.