Tag: Orbit

  • Dark Matter may be behind wobble in Mars’ orbit

    Dark Matter may be behind wobble in Mars’ orbit

    A study published last week proposed that dark matter may be responsible for an observable wobble in Mars’ orbit.

    The study, published in the peer-reviewed scientific journal Physical Review, postulates the theory that dark matter compromises microscopic, or primordial, black holes.

    Unlike astrophysical black holes, these primordial black holes formed when dense pockets of gas collapsed in the seconds after the Big Bang and scattered throughout the universe because of expansion. 

    Despite being as small as an atom, these primordial black holes would be heavier than thousands of solar masses and constitute dark matter. 

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    A panoramic view of Mars (NASA)

    First theorized in the 1930s by Swiss astronomer Fritz Zwicky, dark matter is a form of matter undetectable to the human eye. It does not emit light or energy but makes up roughly a quarter of the universe’s mass. Researchers have proposed its existence based on the gravitational pull on other visible matter.

    dark matter universe

    Though not detectable to the naked eye, dark matter is believed to comprise around a quarter of the universe. (NASA)

    The new study, “Close encounters of the primordial kind,” theorizes that dark matter, made up of primordial black holes, is pushing Mars’ orbit slightly off track because of its extreme mass.

    The researchers, comprising MIT physicists, backed up their theory with a simulation of Mars’ orbit which aligned with their proposal. 

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    The researchers theorized that these primordial black holes would introduce a wobble into Mars’ orbit at least once per decade during zooms through the solar system.

    U.S.-NASA-PRESEVERANCE-ROVER-LANDING

    This image made available by NASA shows an illustration of NASA’s Perseverance rover landing safely on Mars. (Xinhua/NASA/JPL-Caltech via Getty Images)

    Astronomers can detect such a wobble thanks to advances in telemetry, or measuring the distance between planets. 

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    “We’re taking advantage of this highly instrumented region of space to try and look for a small effect,” said co-author and physics professor David Kaiser. “If we see it, that would count as a real reason to keep pursuing this delightful idea that all of dark matter consists of black holes that were spawned in less than a second after the Big Bang and have been streaming around the universe for 14 billion years.”

  • Perihelion Day 2025 Date, Meaning and Significance: All You Need to Know About the Day When the Earth Is Closest to the Sun in Its Orbit

    Perihelion Day 2025 Date, Meaning and Significance: All You Need to Know About the Day When the Earth Is Closest to the Sun in Its Orbit

    Perihelion Day is the day when Earth is closest to the sun in its orbit. This occurs every year, usually around the winter season in the northern hemisphere, which is early January. The word Perihelion is a combination of the Greek words ‘peri,’ which means near, and ‘helios,’ which refers to the sun. Hence, the word aptly describes the phenomenon. It usually takes place anywhere between January 2 and 6, depending on other celestial objects and gravitational forces. As Earth moves around the sun, it goes through different phases and stages that cause changes in our season. Each phase is just a part of its yearly journey. One such phase occurs on Perihelion Day. Here’s all you need to know about it. When Is Perihelion Day 2025? What Does It Mean? Know Perihelion Date, Time and Other Details About the Celestial Event When the Earth Is Closet to the Sun.

    Perihelion Day 2025 Date

    Perihelion Day 2025 falls on Saturday, January 4.

    Perihelion Day Meaning

    On Perihelion Day, Earth is about 147 million kilometres (around 91 million miles) away from the Sun, a bit closer than usual. Even though the Earth is closer to the sun during this time, it does not appear any bigger, and neither does it feel any hotter. This is because the seasons are mainly caused by the title of the Earth’s axis, not its distance from the sun. Perihelion is just one part of Earth’s journey around the sun that affects how we experience the entire year.

    Perihelion Day Significance

    Earth orbits the sun in an elliptical path, which means that it is not a perfect circle. Perihelion Day is very significant as it marks the point in Earth’s orbit when it is the closest to the sun. Perihelion is part of the natural cycle of Earth’s orbit, and it reminds us of how our planet moves through space, affecting how we experience time and seasons throughout the year. Perihelion Day: From Date to Meaning, Everything To Know About the Day When Earth Is Closest to the Sun Every Year!

    This phenomenon is one of the many wonders of our planet’s journey through space. It highlights the fascinating ways Earth’s orbit and position in the solar system shape the cycles and rhythms we experience every year.

    (The above story first appeared on LatestLY on Jan 04, 2025 06:00 AM IST. For more news and updates on politics, world, sports, entertainment and lifestyle, log on to our website latestly.com).