Does the Moon rotate?
And if the Moon rotates, why do we alway see the same side – it never seems to change.
Well, the Moon does rotate. In fact, the Moon takes 27.3 days to turn once on its axis. But the Moon also takes 27.3 days to complete one orbit around the Earth. Because the Moon’s rotation time is exactly the same amount of time it takes to complete an orbit, it always presents the same face to the Earth, and one face away (the Dark Side).
Because it only presents one face to the Earth, astronomers say that the Moon is tidally locked to the Earth. Although the Moon looks like a perfectly smooth ball, it has slight differences in the shape of its gravity field. A long time ago, the Moon did rotate. But each time it turned, the Earth’s gravity tugged at it, slowing down its rotation until it only presented one face to the Earth. At that point, the Moon was tidally locked, and from our perspective, it doesn’t seem to rotate.
Many other moons in the Solar System are also tidally locked to their planet. In fact, most of Jupiter’s large moons are tidally locked.
via Universe Today
Do you use Apple gestures, have you even heard of them?
I was first introduced to them in January of 2008, when I became hipster #1 and bought the first MacBook Air. Now, three years and eight months later I am still barely using them.
Of the available fourteen there are only three I regularly use but those three are absolutely time-saving-revolutionary.
- Scroll with two fingers – just move two fingers up/down, instead of turning a mouse wheel or dragging the sidebar.
- Forward/Back with two fingers – browse the web by “swiping” left or right with two fingers, no more back button.
- Double-tap with two fingers – instead of the right mouse click (called a “secondary click”), tap two fingers to engage a secondary click.
When Apple says they are “fluid, natural, and intuitive,” I wholeheartedly agree. I don’t think about using them anymore and it hurts to use a computer without them. Which is when you know it’s a true innovation, “when you can’t live without it.”
Of the other fourteen, I have three more just barely in my memory. Six out of fourteen?
It does take a while to break the old habits, especially for former Windows users. No more mouse and an almost entirely new language with my fingers. Yeah, it’s tough but I can’t complain about clicking less buttons and gaining agility.
It’s part of the reason why I like Apple products. Their agressive forward pace, while offensive to some, keeps me on my toes and ever-improving. I can only imagine the day when I am able to handle all fourteen:
- Single click
- Dictionary look-up
- Directional scroll
- Smart zoom
- Scroll between screens
- Open Expose
- Secondary click
- Window drag
- Zoom in/out
- Scroll forward/back
- Open Mission Control
- Open Launchpad
- Show desktop
Watch out too because these gestures are growing exponentially. On my last computer there were only 6-7 and now fourteen. It won’t be long before there are 72 gestures encompassing every feature on a computer.
We may even begin to skip the keyboard…have you seen the Swype text-input on Android?