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originally posted by: Ericthedoubter
a reply to: 123143
Unfortunately,it can't.Hubble can only focus on very far objects.
During the exposures, the shadow of Ganymede – the seventh and largest of Jupiter’s moons and also the largest moon in the Solar System – swept across the storm’s center.
But the formula for graviti does not take density into account...does it ?
Planets Lives(or Existence) Matters
In the Enûma Elish, the Babylonian epic of creation, she gives birth to the first generation of deities; her husband, Apsu, (correctly) assuming they are planning to kill him and usurp his throne, later makes war upon them and is killed. Enraged, she, too, wars upon her husband's murderers, taking on the form of a massive sea dragon
The Hubble telescope is known for its views of faraway galaxies, distant planets, dying stars, and black holes. Hubble's snapshots of the moon, however, represent the first time that scientists have used the telescope to support human space exploration. Scientists enlisted Hubble's help because they needed to use ultraviolet light to help find signatures of lunar materials enriched in oxygen. Since ultraviolet light is blocked by gases in the Earth's atmosphere, ground-based telescopes can't use it to observe the lunar surface. But Hubble, orbiting above Earth's atmosphere, can see in ultraviolet light> The telescope mapped variations in reflections of ultraviolet light off the lunar surface to search for specific mineral fingerprints.
originally posted by: MarioOnTheFly
a reply to: Jonjonj
a reply to: TrueBrit
I come to another question...how do we know exactly the mass of planets...that question has been bugging me for a while. I guess we could ballpark the volume of the planet...since we can observe it, but just cant get it through my thick skull...how do we know the mass of a planet.
For example, if we see a moon orbiting a planet at certain distance from it, the orbital period of the moon at that particular distance will mainly depend on the planet's mass. The more massive the planet, the more strongly it attracts the moon and faster the moon moves. It is straightforward for astronomers to calculate the planet's mass after we have observed the motion of one of its moons for a while