Earth's Seasons

Earth's seasons — winter, spring, summer and autumn(or fall) — are caused by the yearly revolution of the Earth in its orbit around the sun and the planet's tilt. When the Northern Hemisphere is pointed toward the sun, it is summer, and when it is pointed away, it is winter (and vice versa for the Southern Hemisphere). Summer and winter are heralded by their respective solstices, while spring and fall begin at an equinox, when the sun crosses Earth's equator and night day are roughly equal length. Below, our stories that relate to Earth's seasons and the ways they affect us.
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Roasting? 7 Scientific Ways to Beat the Heat
A man pours water over his head on a hot day.
July 25th, 2014
As summer heats up, you may be looking for ways to avoid the heat, beyond the common advice of drinking water and staying inside during the hottest parts of the day. Here are seven science-based tips for staying cool.
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Are We Heading for a Worrying Super El Niño?
warm weather, sunny days, el nino
May 2nd, 2014
We have only just moved into May and despite being seven months away from next summer in the southern hemisphere, climate researchers are seeing the beginnings of what could be the most powerful El Niño event since 1997/98.
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Saturday Solstice Marks Official Start of Summer
Summer Beach
June 20th, 2014
The summer solstice will occur Saturday (June 21), marking the official start of summer.
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Have a Question about Your Fitness? Join Our Twitter Chat
A fit-looking woman raises her arms over her head in celebration.
May 29th, 2014
What would you like to know about health, fitness and dieting before beach season starts?
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Where Are Tornado Hot Spots Outside of the US?
Tornado over Millsap, Texas
April 22nd, 2014
The United States is not the only country that possesses the prime ingredients and topography to harness these often life-threatening storms.
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Invasive Pests vs. Polar Vortex: Who Will Win?
Emerald ash borer
March 4th, 2014
The sub-freezing temperatures breaking records across the country have one group of observers cheering: biologists, many of whom hope that a polar vortex or two will help slow the northward march of invasive species.
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Happy Summer! Surprise Snowstorm Clobbers Rockies
June 19th, 2014
A bizarre June snowstorm hit Glacier National Park in Montana and parts of Utah and Idaho this week, leaving many residents and visitors in the northern Rockies wondering what season it is.
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Storm to Spoil Spring for Millions Next Week in Midwest, East
weather, spring, rain, storms
April 22nd, 2014
A large storm will form over the eastern half of the nation next week and will bring a swath of unsettled conditions for days.
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