Spring gets its official start Friday in the Northern Hemisphere with the arrival of the vernal equinox. But what does that mean? The Earth's axis is tilted at an angle as it travels around the sun. On the equinox, the Earth's tilt is neither toward nor away from the sun, so both hemispheres get the same amount of sunlight. This means day and night last about the same amount of time. It also marks the start of a new season. Days will get a little longer every day in the Northern Hemisphere until the solstice in June.
On Feb. 20, 1962, astronaut John Glenn became the first American to orbit the Earth, circling the globe three times aboard Project Mercury's Friendship 7 spacecraft in a flight lasting 4 hours and 55 minutes before splashing down safely in the Atlantic Ocean.
The replacements for the astronauts involved in NASA's first medical evacuation are on their way to the International Space Station. SpaceX launched the fresh crew on Friday from Florida. The four astronauts are representing the U.S., France and Russia and should reach the orbiting lab Saturday. They'll fill the vacancies left by their evacuated colleagues. NASA had to put spacewalks on hold and defer other duties after an unidentified astronaut experienced a serious medical issue in January. The entire crew returned to Earth more than a month early, leaving three astronauts in orbit.
NATO-nation intelligence services believe Russia is developing a weapon to target Starlink satellites. Intelligence findings seen by The Associated Press say the weapon could release pellets to disable multiple satellites. Analysts have doubts, saying such a weapon could create chaos in space and risk other vital orbiting systems. But a Canadian space commander told the AP that such a weapon is "not implausible." Starlink's services are used by Ukraine. Russia views the constellation as a threat. The intelligence findings say the destructive pellets could be small enough to evade detection. Analysts say Russia might want to have such a weapon only as a deterrent or it may be no more than a research project for now.
Sunday marks the shortest day of the year in the Northern Hemisphere, signaling the start of astronomical winter. In the Southern Hemisphere, it's the longest day, marking the beginning of summer. The term "solstice" comes from Latin, meaning the sun's "pause" in its annual path. After the winter solstice, the sun begins to climb higher, and days gradually lengthen until late June. Solstices have been celebrated for ages, with monuments like Stonehenge aligning with the sun's paths. The equinox, in contrast, is when both hemispheres receive equal sunlight, leading to nearly equal day and night lengths.
A telescope in Chile has captured a stunning new picture of the Butterfly Nebula, a grand and graceful cosmic wonder. The National Science Foundation's NoirLab released the picture Wednesday. Snapped last month by the Gemini South telescope, the aptly named Butterfly Nebula is 2,500 to 3,800 light-years away. At the heart of this bipolar nebula is a white dwarf star that cast aside its outer layers of gas long ago. The discarded gas forms the butterflylike wings billowing from the aging star. Schoolchildren in Chile chose this astronomical target to celebrate 25 years of operation by the International Gemini Observatory.
Four astronauts are on their way to the International Space Station after being sidelined by Boeing's Starliner trouble and other issues. SpaceX launched the U.S.-Japanese-Russian crew from Florida on Friday. They should reach the space station this weekend, replacing colleagues who launched in March as fill-ins for NASA's two stuck astronauts. Leading the taxi flight for NASA is Zena Cardman. She was yanked from a SpaceX flight last year to make room for Starliner's test pilots whose capsule was judged too dangerous to fly. Two of her crewmates were also training on Starliner, which remains grounded until next year.
