関連する実験動画
Updated: Jul 11, 2026

11:34
Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
まとめ
バイキング・オービター-1 (VO-1) は火星を研究した.
科学分野:
- 惑星科学は惑星科学である.
- 天文学 (astronomy) 天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは
- 天体物理学 天体物理学
背景:
- 火星の2つの衛星の1つであるフォボスは,科学的な関心の対象となっている.
- 以前のミッションは,フォボスの物理的特徴に関する限られたデータを提供した.
研究 の 目的:
- フォボスの科学的な調査を徹底する.
- フォボスの高解像度画像と赤外線観測を取得する.
- フォボスの質量と密度を推定する.
主な方法:
- ヴィーキング・オービター-1 (VO-1) の宇宙船を接近飛行と画像撮影に利用した.
- 125以上のテレビ画像と赤外線データを取得しました.
- VO-1の軌道に対するフォボスの重力効果を,放射線測定で測定した.
主要な成果:
- 30メートルの解像度でフォボスの照らされた半球の約80%をイメージした.
- 表面から80km以内の飛行距離を達成した.
- フォボスの質量 (GM) を推定し, ~1.9 g/cm3 の平均密度を決定した.
結論:
- フォボスの低密度とスペクトル反射度は,炭酸性コンドライトとの類似性を示唆しています.
- これは,フォボスが外側の小惑星帯で形成された可能性を示唆しています.
- この発見は,初期の太陽系における物質凝縮に関する既存の理論に異議を唱えている.
関連する概念動画
Impact: Problem Solving
In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
Thomson's e/m Experiment
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
Conditions on Early Earth
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Conditions on Early Earth
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Rocket Propulsion in Empty Space - I
The driving force for the motion of any vehicle is friction, but in the case of rocket propulsion in space, the friction force is not present. The motion of a rocket changes its velocity (and hence its momentum) by ejecting burned fuel gases, thus causing it to accelerate in the direction opposite to the velocity of the ejected fuel. In this situation, the mass and velocity of the rocket constantly change along with the total mass of ejected gases. Due to conservation of momentum, the rocket's...
Rocket Propulsion In Empty Space - II
The motion of a rocket is governed by the conservation of momentum principle. A rocket's momentum changes by the same amount (with the opposite sign) as the ejected gases. As time goes by, the rocket's mass (which includes the mass of the remaining fuel) continuously decreases, and its velocity increases. Therefore, the principle of conservation of momentum is used to explain the dynamics of a rocket's motion. The ideal rocket equation gives the change in velocity that a rocket experiences by...

