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<!DOCTYPE html>

<html lang="en">
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            Explore Mars
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          <li><a href="#moons" class="link-cat">Moons</a></li>
          <li><a href="phobos.html" class="sub-link">Phobos</a></li>
          <li><a href="deimos.html" class="sub-link">Deimos</a></li>
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      <div class="phobos hero">
        <h1>Phobos: The Greater Moon</h1>
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          <h2>Phobos Overview</h2>
          <p>
            Phobos is the larger and innermost of Mars' two moons, discovered in
            1877 by astronomer Asaph Hall. It measures about 22 kilometers in
            diameter and has an irregular, potato-like shape, covered in craters
            and dust. Orbiting Mars at a mere 6,000 kilometers above the
            surface—closer than any other moon to its planet—Phobos completes a
            full orbit every 7.65 hours, rising and setting twice a day from the
            Martian perspective.
          </p>
          <p>
            The moon's surface is marked by Stickney Crater, its largest impact
            feature at 9 kilometers wide, which nearly shattered Phobos.
            Scientists believe it originated from the asteroid belt, captured by
            Mars' gravity, rather than forming alongside the planet. Its low
            density suggests a porous, rubble-pile structure, possibly
            containing ice beneath the regolith.
          </p>
          <p>
            Phobos is doomed to a dramatic fate: tidal forces are pulling it
            closer to Mars at about 1.8 meters per century. In roughly 30-50
            million years, it may either collide with the planet or disintegrate
            into a ring system. Missions like Japan's MMX (Martian Moons
            eXploration), planned for sample return in the late 2020s, aim to
            study its composition and origins further as of 2025.
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