• Why can’t we colonize the moon or mars if China wants to?

    China will build a base on the moon and mars to mine resources but we can’t because we don’t want to?
    China will build a base on the moon and mars to mine resources but we can’t because we don’t want to?
    10 answers · 5 hours ago
  • Why do people believe in aliens?

    I saw a clip of a news report on fox about aliens. It seems like every ufo sighting has been given a reasonable explanation. One time it was aircraft testing another time weather balloons. Why do people still believe in aliens when nearly every sighting turned out to be fake?
    I saw a clip of a news report on fox about aliens. It seems like every ufo sighting has been given a reasonable explanation. One time it was aircraft testing another time weather balloons. Why do people still believe in aliens when nearly every sighting turned out to be fake?
    21 answers · 3 days ago
  • I'm told the sun will turn into a red giant when it runs out of hydrogen. Hypothetically, is it possible to prolong the time that will take?

    I recognize that this will be long after I am dead. This is merely a theoretical exercise.
    I recognize that this will be long after I am dead. This is merely a theoretical exercise.
    12 answers · 3 days ago
  • How did Earth and other planets form?

    10 answers · 23 hours ago
  • Is the sun yellow or orange?

    Best answer: White, ever so slightly yellow. A "blackbody" at a temperature of 6000 K (approximately 10,340 F) emits light tthat is (by definition) pure white. Yellow is around 4000 K Sun is around 5770 K, making it almost pure white, with a tinge of yellow. When sunlight goes through out atmosphere, the blue... show more
    Best answer: White, ever so slightly yellow.

    A "blackbody" at a temperature of 6000 K (approximately 10,340 F) emits light tthat is (by definition) pure white.

    Yellow is around 4000 K

    Sun is around 5770 K, making it almost pure white, with a tinge of yellow.

    When sunlight goes through out atmosphere, the blue light is diffracted by the atmosphere (the sky looks blue because of that diffracted light), leaving the visible disk to appear more yellow than it actually is (having lost part of its blue light to the air).

    For us (humans) "white" is the mix of the yellowish light from the visible Sun PLUS the blue of the sky.
    13 answers · 2 days ago
  • Could other planets have tiny lilipudlian people living on them?

    I mean is it entirely possible?
    I mean is it entirely possible?
    8 answers · 15 hours ago
  • Are the stars in are sky dead?

    I know that it only takes a few minutes for light to travel from the sun to our planet. But it can take billions of years for the light from the most distant gallexies to reach ours. If this is the case. Wouldnt most of these stars of already turned to red giants and perished by the time thier youthful light... show more
    I know that it only takes a few minutes for light to travel from the sun to our planet. But it can take billions of years for the light from the most distant gallexies to reach ours. If this is the case. Wouldnt most of these stars of already turned to red giants and perished by the time thier youthful light sources reached us?
    22 answers · 4 days ago
  • Does anyone here remember Comet Hale-Bopp in '97? It was a bright comet, but not compared to Hyakutake.?

    I remember observing it with binoculars and then the crazy story of the Heaven's Gate Cult broke on the news. The weird thing is the Heaven's Gate still has a webpage online, saved from really old software kept on floppy discs! https://motherboard.vice.com/en_us/artic...
    I remember observing it with binoculars and then the crazy story of the Heaven's Gate Cult broke on the news. The weird thing is the Heaven's Gate still has a webpage online, saved from really old software kept on floppy discs! https://motherboard.vice.com/en_us/artic...
    11 answers · 2 days ago
  • Do planets in the solar system have a day time?

    Best answer: Of course. They all see the Sun. At any time, obviously half the planet is facing the Sun and the other half isn't. And they all spin, so there will be day when you can see the Sun, and night when you can't see the Sun. They spin at different speeds, so how long a day is varies a lot. On that subject,... show more
    Best answer: Of course. They all see the Sun. At any time, obviously half the planet is facing the Sun and the other half isn't. And they all spin, so there will be day when you can see the Sun, and night when you can't see the Sun. They spin at different speeds, so how long a day is varies a lot.

    On that subject, Venus spins "the wrong way" (the opposite way from the direction it orbits the Sun) and slowly, so slowly that it takes more than a Venus year to spin once. In that sense, a day on Venus is longer than a year! But because it's spinning "backwards", an actual day from sunrise to sunrise lasts a bit over half a year. Though whether you'd actually notice is another question - Venus is covered in thick acid clouds that would make it impossible to see anything in the sky (astronomers have only been able to map it by radar), and they also hold in heat so well that it doesn't cool down at night. As the Russians found when they sent probes to land on Venus, basically you have to build your probe like a tank so it won't melt, get eaten by acid, or get crushed by the huge atmospheric pressure.

    There are some more oddities. Earth has an atmosphere (fortunately not like Venus), and its axis of spin isn't far off vertical compared with the direction it travels in orbit round the Sun. Not all other planets are like that.

    If a planet has no atmosphere, then there will be a black sky during the day as well because there is no air to scatter the sunlight. Mercury is like this.

    If the axis of spin is very far off the vertical, days are going to get weird. Uranus is virtually "lying on its side" as it goes round the Sun, so how long a day is varies enormously depending on where on the planet you are - if "on it" actually means anything, as nobody knows if it has any solid surface. At the poles, a full day and night are the same length as a year (84 of our years because it's so far off). Which is true on the Earth as well - the scientists at the South Pole base get a 6 month day followed by a 6 month night. But at other places on Uranus there will be some wild variation on how long a day or night is.

    And with the gas giant planets, they're so far away from the Sun that it won't be significantly brighter during the day, or significantly warmer.
    17 answers · 4 days ago
  • Are you prepared for the following astronomical occurences?

    -A large meteor will hit the Earth someday. I'd bet my wife on that. -A packet of anti matter will barely miss Earth, shaking us out of our complacency about "wandering anti-matter". -A UFO so freaky and unexplanable will occur in the sky over a major city and scare the bejesus out of everyone. Even... show more
    -A large meteor will hit the Earth someday. I'd bet my wife on that. -A packet of anti matter will barely miss Earth, shaking us out of our complacency about "wandering anti-matter". -A UFO so freaky and unexplanable will occur in the sky over a major city and scare the bejesus out of everyone. Even people who don't believe in Jesus. The government will insist that a screechy high pitched sounding, mountain sized object, projecting colors of previously undiscovered wavelenghths sucking up an ocean was nothing but a weather balloon. -A large meteor will hit the Earth in five minutes. I'd bet the mother in law on that one. -The sun will get so large it will swallow Earth and the moon. -The moon. Moving away from us a few inches a year. WHAT!?? - a pole shift on a gaseous planet...probably Jupiter. -Saturn's rings may wander over and choke out Neptune one day. -A general increase of radiation, a depletion of Earth's resources, and general chaos here on Earth. If you are not prepared, it helps to start making lists- to help one become better prepared.
    9 answers · 2 days ago
  • Can I eat life on Mars?

    Best answer: After you find life on Mars, you will have to start worrying if it might want to eat you.
    Best answer: After you find life on Mars, you will have to start worrying if it might want to eat you.
    11 answers · 2 days ago
  • What would it mean if the volume of a black hole was actually just -1 cubic metre?

    Please excuse my ignorance. I will only award a best answer if you answer my question politely, because I understand event horizons cover the black holes, acretion disks are the swirling matter around the event horizon, gamma-ray bursts don t actually shoot out of the black hole, singularities are just hypothetical... show more
    Please excuse my ignorance. I will only award a best answer if you answer my question politely, because I understand event horizons cover the black holes, acretion disks are the swirling matter around the event horizon, gamma-ray bursts don t actually shoot out of the black hole, singularities are just hypothetical single points of infinite density, and that the actual black hole is a spherical object. I m just curious in the hypothetical situation what we would observe if we survived long enough to see the black hole and instead of being 0 cubic metres, what would we observe if it was -1 cubic metres, as in negative one? What would happen if we passed through it(if possible)?
    6 answers · 14 hours ago