Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.
Closer to the horizon, the sky fades to a lighter blue or white. The sunlight reaching us from low in the sky has passed through even more air than the sunlight reaching us from overhead. As the sunlight has passed through all this air, the air molecules have scattered and rescattered the blue light many times in many directions.
As the Sun gets lower in the sky, its light is passing through more of the atmosphere to reach you. Even more of the blue light is scattered, allowing the reds and yellows to pass straight through to your eyes.
Twitter Blue is an opt-in, paid subscription that adds a blue checkmark to your account and offers early access to select features, like Edit Tweet. Subscribe now with localized pricing starting at $8/month or $84/year in available countries to get the blue checkmark in addition to early access to features.*
Until now, Twitter used the blue checkmark to indicate active, notable, and authentic accounts of public interest that Twitter had independently verified based on certain requirements. Now the blue checkmark may mean two different things: either that an account was verified under the previous verification criteria (active and authentic), or that the account has an active subscription to Twitter Blue. Learn more about the different forms of verification on Twitter here.
Twitter reserves the right without notice to remove your blue checkmark at any time in its sole discretion without offering you a refund, including if you violate our Terms of Service or if your account is suspended.
For now, you will have all the same features as new Twitter Blue verified accounts, except that you will not get a blue checkmark nor will your Tweets be prioritized in the verified section of the Notifications timeline.
An active Twitter Blue subscription adds a blue checkmark to your account and offers early access to select new features. The features included in Twitter Blue are subject to change at any time as we continue to improve the service.
Now the blue checkmark may mean two different things: either that an account was verified under the previous verification criteria (active, notable, and authentic), or that the account has an active subscription to Twitter Blue. Accounts that receive the blue checkmark as part of a Twitter Blue subscription will not undergo review to confirm that they meet the active, notable and authentic criteria that was used in the previous process.
Once subscribed to Twitter Blue, changes to your profile photo, display name, or username (@handle) will result in the loss of the blue checkmark until the account is validated as continuing to meet our requirements, and no further changes will be allowed during this review period. Learn more about checkmark requirements here.
Note: If you subscribe to the new Twitter Blue and cancel your subscription, your blue checkmark will remain until the end of the subscription term you paid for, unless your account is suspended or the blue checkmark is otherwise removed by Twitter for any reason.
Yes. Subscribers on web should upgrade to the new $8/month or $84/year (or your local pricing) subscription and subscribers on iOS or Android should upgrade to the new $11/month (or your local pricing) subscription to access existing features and get a blue checkmark.*
*All Twitter Blue features will be available immediately except the blue checkmark, which will appear on eligible profiles after a review to ensure subscribed accounts meet all eligibility criteria.
Yes. Subscribers on web should upgrade to the new $8/month subscription and subscribers on iOS or Android should upgrade to the new $11/month (or your local pricing) subscription to access existing features and get a blue checkmark.*
Blue checkmarks will show on all accounts subscribed to Twitter Blue for the duration of their subscription. The blue checkmark will be temporarily removed from accounts subscribed to Twitter Blue following changes to the display name, profile photo, or username (@handle) until those changes are reviewed.
Blue checkmarks obtained with a Twitter Blue subscription cannot be turned off by subscribers during the term of their subscription. Even canceling the subscription will not remove the blue checkmark until the subscription term expires.Twitter reserves the right without notice to remove your blue checkmark at any time in its sole discretion without offering you a refund, including if you violate our Terms of Service or your account is suspended.
No, blue checkmarks obtained with a Twitter Blue subscription cannot be turned off by subscribers during the term of their subscription - even canceling the subscription will not remove the blue checkmark until the subscription term expires.
The number of blue whales today is only a small fraction of what it was before modern commercial whaling significantly reduced their numbers during the early 1900s, but populations are increasing globally. The primary threats blue whales currently face are vessel strikes and entanglements in fishing gear.
NOAA Fisheries and its partners are dedicated to conserving and rebuilding blue whale populations worldwide. We use a variety of innovative techniques to study, protect, and rescue these endangered animals. We engage our partners as we develop regulations and management plans that foster healthy fisheries and reduce the risk of entanglements, create whale-safe shipping practices, and reduce ocean noise.
Blue whales were significantly depleted by commercial whaling activities worldwide. Today, blue whales are listed as endangered under the Endangered Species Act and protected under the Marine Mammal Protection Act. The latest stock assessment reports of blue whales include data for various stocks, including areas of the North Pacific and western North Atlantic Oceans.
Antarctic blue whales are generally larger than other blue whale subspecies. For example, in the North Atlantic and North Pacific, blue whales can grow up to about 90 feet and are over 100,000 pounds, but in the Antarctic, they can reach up to about 110 feet and weigh more than 330,000 pounds. Like many other baleen whales, female blue whales are generally larger than males.
Along the West Coast of the United States, eastern North Pacific blue whales are believed to spend winters off of Mexico and Central America. They likely feed during summer off the U.S. West Coast and, to a lesser extent, in the Gulf of Alaska and central North Pacific waters.
Scientists know little about the life history of the blue whale. The best available science suggests the gestation period is approximately 10 to 12 months. Weaning probably occurs at around 6 to 7 months on, or en route to, summer feeding areas. The age of sexual maturity is thought to be 5 to 15 years. Most reproductive activity, including births and mating, takes place during the winter. The average calving interval is probably 2 to 3 years.
Vessel strikes can injure or kill blue whales. Vessel strikes have killed blue whales throughout their range, but the risk is much higher in some coastal areas with heavy vessel traffic, like ports and in shipping lanes, and from larger vessels and vessels traveling at high speeds.
NOAA Fisheries conducts various research activities on the biology, behavior, and ecology of blue whales. The results of this research are used to inform management decisions and enhance recovery efforts for this endangered species.
Scientists working on the WhaleWatch project are using advanced technologies to predict where blue whales are likely to be in near real-time off the U.S. West Coast. This near real-time information helps reduce human effects on whales by providing information on where the whales occur and hence where whales may be most at risk from threats such as vessel strikes, entanglements, and underwater noise. Scientists developed habitat-based model estimates of whale occurrence that combine satellite tracking of whales with information on the environment.
The Forest Commission created two more historically significant maps of the Great Forest of Northern New York (the Adirondacks). The first (1890) shows forest preserve areas outlined in red, and the proposed park outlined in blue. The second (1891) shows a slightly different park proposal outlined in blue.
Use of a "blue line" to depict the proposed park boundary was the genesis of the term "blue line." Today, "blue line" means the actual boundaries of the Adirondack and Catskill Parks. More than a century later, the blue ink on the original maps has darkened, appearing almost black.
On May 20, 1892, NYS Governor Roswell P. Flower signed the law creating a 2.8 million-acre Adirondack Park. The 1891 "blue line" was intended to delineate the boundary within which future forest preserve acquisitions should be focused.
The objective is to overcome the existing constraints in all aspects of the maritime sector, in particular recruitment, training, capacity-building, technical cooperation and promotions, so that every person can fully and safely participate in the activities of the sustainable blue economy.
The actions funded under this call will help sustainable blue economy sectors to embrace a deep and structural change to facilitate the inclusion of women in the wider maritime economy, thus contributing to a more gender equal society as a whole.
An ancient range, a stainless steel sink and a century-old history of entertaining the islanders sat inside the shuttered blue building on Petronia Street in the heart of old Key West, in the Florida Keys.
The blue whale is the largest animal on the planet, weighing as much as 200 tons (approximately 33 elephants). The blue whale has a heart the size of a Volkswagen Beetle. Its stomach can hold one ton of krill and it needs to eat about four tons of krill each day. They are the loudest animals on Earth and are even louder than a jet engine. Their calls reach 188 decibels, while a jet reaches 140 decibels. Their low frequency whistle can be heard for hundreds of miles and is probably used to attract other blue whales. 2b1af7f3a8