1–20 of 24 results
Can a Planet Think?

Cosmic Relief with David Grinspoon

Can a Planet Think? The Gaia Hypothesis, Rethought

Humans have irrevocably changed the planet. Have those processes gone so far that Earth’s biosphere has begun to resemble a human brain?

Chang'e 4 lander

Cosmic Relief with David Grinspoon

One Small Step for Plantkind

With a seed germinated on the lunar farside, Earth’s biosphere made its first tentative foray into the cosmos.

Greenland crater

Cosmic Relief with David Grinspoon

Sudden Impact: What Greenland's Crater Means for Our Planet's History

The discovery of a recent huge meteor crater beneath Greenland’s ice sheet has reignited a debate over cosmic influences.

Cosmic Relief with David Grinspoon

NASA Renews Interest in SETI

After a long hiatus, NASA gets back into the SETI game with a workshop on “technosignatures.”

Cosmic Relief with David Grinspoon

Clouds: A Nebulous Existence

In David Grinspoon's latest column, he discusses how, for both Venus and Earth, life's last refuge might lie in the clouds.

Cosmic Relief with David Grinspoon

Variations on a Theme: What Do Earth and Pluto Share in Common?

Nature loves to riff on existing motifs, even in the most unearthly of environments.

Cosmic Relief with David Grinspoon

Advancing the SETI Quest

Hope, perseverance, and the courage of their convictions sustain those seeking hints of alien civilizations and advancing the SETI quest.

Cosmic Relief with David Grinspoon

Chipping Away at Exoplanets

Human ingenuity is helping us unlock the secrets of unimaginably distant worlds — exoplanets.

Cosmic Relief with David Grinspoon

Cosmic Communion: A Total Solar Eclipse

Last summer's total solar eclipse provided a profound moment of celestial accord for millions of Americans.

Cosmic Relief with David Grinspoon

Life Outside the Habitable Zone

What would allow a planet to host life? The habitable zone is often defined as the distance from a star where liquid water can exist on a planet's surface.

Cosmic Relief with David Grinspoon

Not Venus Again

Once more, NASA leaves our sister planet out of the mix of new missions. Ouch.

Mars

Cosmic Relief with David Grinspoon

Mars and Our Expectations

The Red Planet has inspired a long history of brilliant mistakes.

Solar System

Cosmic Relief with David Grinspoon

Thank Our Lucky Planets: How Planets Really Do Shape Our Fate

Human history has always been linked to the influence of distant orbits, from climate change (past and present) to our exploration of the solar system.

Cosmic Relief with David Grinspoon

Mars Reconnaissance Orbiter: Ten Years Over Mars

It’s easy, but wrong, to take for granted a mission that’s still going strong after a decade.

Anthropocene's Golden Spike: Tranquility Base

Cosmic Relief with David Grinspoon

The Golden Spike of Tranquility Base

A modest proposal: the golden spike that marked the beginning of the Anthropocene was the first lunar landing in Mare Tranquilitatis.

Scott Kelly aboard International Space Station

Cosmic Relief with David Grinspoon

International Space Station: Our Year In Space

ISS astronauts are reviving our passion for space travel in novel ways.

Comet Swarm

Cosmic Relief with David Grinspoon

Could It Be: Possible Signs of Extraterrestrial Intelligence?

We need to learn how to talk about possible signs of extraterrestrial intelligence.

Radio Dish

Cosmic Relief with David Grinspoon

No Need to Feel Lonely

Are we alone in the universe? Recent results don't support that conclusion, despite what the headlines say.

Venus Express in orbit

Cosmic Relief with David Grinspoon

Farewell to a Friend

After a tremendously successful mission, Venus Express has orbited its last.

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