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A view of Africa taken by Apollo 11 astronauts on July 20, 1969.

The first day of spring is finally here — for about 90% of us. Here’s why equinoxes mark the changing of seasons.

The spring or vernal equinox happens at 5:58 p.m. ET on Wednesday, March 20, 2019. Here's how Earth and the sun work together to change our seasons.
Testing has shown a connection between vitamin D and depression.

Everything you need to know about Vitamin D and how it’s linked to your mood

Vitamin D can be very important for your overall health, but especially for your mood. We asked two experts how big that link is.
An illustration of Earth during the December solstice in 2018.

The December solstice is here. Here’s how it works and why it starts winter and summer at the same time.

The winter solstice happens Friday — if you live in Earth's Northern Hemisphere. For the Southern Hemisphere, it's the start of summer.
The sun is the best source of vitamin D, but it's not the only source.

How to get enough vitamin D without the sun

The sun is the best source of vitamin D, but it's not the only source. Here's what you should know about getting enough vitamin D, without the sun.
An illustration of NASA's Voyager probe drifting through space.

NASA says Voyager 2 is the second human object ever to touch interstellar space — the void between stars

NASA says its Voyager 2 probe flew into interstellar space in November and beyond the sun's reach. However, the robot has not left the solar system.
An illustration of NASA's Parker Solar Probe flying past the sun.

NASA just smashed the record for the fastest human-made object — its $1.5 billion solar probe is flying past the sun at up to 213,200 mph

NASA's Parker Solar Probe is on its first of 24 close passes around the sun. On Monday, the spacecraft reached a record-breaking speed of 213,200 mph.
NASA's Parker Solar Probe launches into space on a powerful Delta 4 Heavy rocket on August 12, 2018.

NASA is about to ‘touch’ a star for the first time — here are the hellish conditions the Parker Solar Probe must survive

NASA's Parker Solar Probe successfully launched into space on August 12 on an unprecedented mission to "touch" the sun. But now it needs to endure temperatures will reach a searing 2,500 degrees as the spacecraft zooms through the star's atmosphere at speeds close to 430,000 mph.
NASA's Parker Solar Probe must withstand blistering temperatures and incredible speeds near the sun.

NASA is about to launch the fastest spacecraft in history in a $1.5-billion attempt to ‘touch the sun’ for the first time

On Sunday, NASA plans to launch the Parker Solar Probe probe, which will use a high-tech heat shield to fly closer to the sun than any mission in history. The robot is designed to study the sun's super-hot atmosphere and help scientists predict space weather events that can wreak havoc on Earth.
A total solar eclipse is photographed from atop Carroll Rim Trail at Painted Hills, a unit of the John Day Fossil Beds National Monument, near Mitchell, Oregon, U.S. August 21, 2017

A solar eclipse is coming tomorrow — but it won’t be as spectacular as last year’s

The summer of 2018 continues to be a blockbuster for fantastic celestial events. On Saturday, some skywatchers will be treated to a partial solar eclipse.
The moon is seen as it begins a total lunar eclipse that will turn the moon red over Buenos Aires April 15, 2014.

The longest total lunar eclipse in a century happens this week — here’s the difference between a lunar and solar eclipse

A total lunar eclipse, or blood moon, will happen on July 27. Lunar eclipses and solar eclipses are essentially the reverse of one another; the difference is the relative positions of the Earth, sun, and moon.