You have to go far south on Earth’s globe to see the Southern Cross. Bluish Acrux, aka Alpha Crucis, is its brightest star.
Last December 18, a big “fireball” or bright meteor exploded above the Bering Sea with more than 10 times the energy of the atomic blast over Hiroshima. Satellites saw it all.
. | A NASA instrument aboard the Terra satellite captured this true-color image of a fireball - or extremely bright meteor - over the Bering Sea on December 18, 2018. The image shows the fireball as well as the meteoroid's path, marked by a dark trail of smoke over thick, white clouds. Animation via NASA GSFC
Are we alone? If advanced alien civilizations are out there, why haven’t we heard from them? Scientists call this Fermi’s Paradox – aka The Great Silence – and they gathered in Paris last week to discuss it.
A new theory says that the ever-slowing speed at which our brain processes images as we get older speeds up our perception of time.
Donsol, Philippines. Image credit: Jv Noriega
Aspen trees – fondly called Quakies by some – have trembling, quivering leaves. Now those leaves have inspired an energy-harvesting mechanism that might rescue dust-laden rovers on Mars.
The leaves and trunks of quaking aspen - Populus tremuloides - via The Wild Garden
The runaway pulsar escaped the blast wave of the supernova that formed it, astronomers say, and is hurtling through space so fast it could travel from Earth to the moon in just 6 minutes.
The CTB 1 supernova remnant resembles a ghostly bubble in this image, which combines new 1.5 gigahertz observations from the Very Large Array (VLA) radio telescope (orange, near center) with older observations from the Dominion Radio Astrophysical Observatory’s Canadian Galactic Plane Survey (1.42 gigahertz, magenta and yellow; 408 megahertz, green) and infrared data (blue). The VLA data clearly reveal the straight, glowing trail from pulsar J0002+6216 and the curved rim of the remnant’s shell. CTB 1 is about half a degree across, the apparent size of a full Moon. Image via Jayanne English, University of Manitoba, NRAO/F. Schinzel et al., DRAO/Canadian Galactic Plane Survey/NASA/IRAS.
Easter generally falls on the 1st Sunday following the 1st full moon following the vernal equinox. Last night’s full moon came about 4 hours after the astronomical equinox. So why isn’t this Sunday Easter?
Image via TheAldertonSwan.
New evidence suggests that humans have a magnetic sense that lets our brains detect and respond to Earth’s magnetic field.
Looking for an easy, but profound, sky activity? Note how far the sunset moves on your horizon, as spring shifts toward summer, or autumn toward winter, on your part of the globe.
From the December solstice to the June solstice, the sunset makes its way north, as illustrated in this photo composite by Abhijit Juvekar. Thanks, Abhijit!