Atul Kumar Rai

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Mars and Venus have already lost their oceans–Earth could be next

We already knew about Venus. We had our suspicions about Mars. Now we’re sure.<p>Our two closest solar system neighbors once had oceans—planet-encircling, globe-girdling, Earth-like oceans. But waterbearing planets are fragile. Venus didn’t have the right stuff and lost her oceans to space. We have …

Chemistry

Chemistry explains why grilling meat makes it taste so much better

Between dazzling fireworks and delicious cold brews, millions of people will be firing up their grills and throwing on tenderloins, flank steaks, pork shoulder and many more combinations of savory meats to celebrate.<p>But what actually <i>happens</i> to the meat when it hits high heat that makes it so …

Chemistry

HyperSolar Nears Voltage Needed For Solar Hydrogen Production

What's so magical about 1.5 volts, you may ask?<p>It turns out that it's the practical voltage required to produce hydrogen gas from water using …

Fuel Cell

Venus and Jupiter planetary conjunction gives skywatchers a Canada Day treat

Canada Day fireworks aren't the only sparkle to watch for in the sky Wednesday night.<p>Skywatchers will get a special treat as the two brightest …

Astronomy

Water Escapes a Warm Planet — Will Earth Become Like Mars?

<i>This article was originally published on The Conversation. The publication contributed this article to Space.com's</i> Expert Voices: Op-Ed & Insights.<p>We …

Chemistry

Brian Bi's answer to Does gravity affect the speed of light?

<b>This question is more complicated than it looks.</b> Just saying "no" isn't a very useful answer. After all, it is said that due to the expansion of the …

Is the universe ringing like a crystal glass?

Astronomy

Black Holes Could Turn You Into a Hologram, and You Wouldn’t Even Notice — NOVA Next

Few things are as mysterious as black holes. Except, of course, what would happen to you if you fell into one.<p>Physicists have been debating what …

How Physics Will Change—and Change the World—in 100 Years — NOVA Next

One hundred years ago, Albert Einstein had only just published his revolutionary new theory of gravity, atomic nuclei were entirely mysterious, and …

Will Science Someday Rule Out the Possibility of God?

Over the past few centuries, science can be said to have gradually chipped away at the traditional grounds for believing in God. Much of what once …