Earth's Place in the Universe

  1. Planets

    No, organic molecules alone don’t point to life on Mars

    These carbon-based molecules, found in a meteorite, may reflect merely a mixing of water and minerals on the Red Planet over billions of years.

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  2. Physics

    Explainer: Gravity and microgravity

    The force of gravity holds us on the ground, keeps planets in orbit and extends throughout space. A very weak gravitational pull is called microgravity.

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  3. Space

    Explainer: Telescopes see light — and sometimes ancient history

    Different kinds of telescopes on Earth and in space help us to see all wavelengths of light. Some can even peer billions of years back in time.

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  4. Space

    The long-awaited James Webb Space Telescope has a big to-do list

    The James Webb Space Telescope has been in the works for so long that new fields of science have emerged for it to study.

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  5. Space

    Scientists Say: Solar wind

    This is a powerful gust of charged particles that flows out from the sun through the solar system.

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  6. Space

    Astronomers may have found first known planet in another galaxy

    The spiral-shaped Whirlpool galaxy may be home to the first planet spotted outside our own Milky Way galaxy.

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  7. Space

    Let’s learn about the hunt for alien life

    Finding any extraterrestrials, from advanced alien civilizations to simple microbes, would be an unmatched discovery.

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  8. Earth

    Explainer: The age of dinosaurs

    Take a trip back to the Mesozoic Era to explore how geologic events, ecosystems and evolution were connected during the so-called age of dinosaurs.

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  9. Space

    Explainer: Calculating a star’s age

    Scientists can figure out a star's mass or composition pretty easily. Determining how old that star is, however, is a lot harder.

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  10. Planets

    NASA’s Perseverance rover grabbed its first Martian rocks

    Two finger-sized pieces of stone drilled from a basalt rock are the first bits of Mars ready to be brought to Earth.

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  11. Planets

    Pluto is no longer a planet — or is it?

    In the 15 years since Pluto lost its status as a planet, some scientists continue to use whatever definition works best for them.

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  12. Space

    Here’s an easier new way to weigh a black hole

    The timing of flickers in the gas and dust of a black hole’s accretion disk correlates to its mass, a new study finds.

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