user: Unlocking the Mysteries of Jupiter
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WATCH: The spacecraft traveled more than a billion miles before entering into Jupiter's orbit.

After a 1.7-billion-mile journey to Jupiter, the Juno space probe's work is only just beginning.

The solar-powered spacecraft sent home confirmation Monday night that it had successfully entered into an elliptical orbit around the Jovian giant. Over the next few months, science teams will test the spacecraft's systems and conduct a final calibration of its science instruments before the official data collection phase begins in October.

And yet it moves. What Galileo saw through his telescope, I captured on approach to #Jupiter https://t.co/q3yCNsirYk pic.twitter.com/vBBwpoRMm0

— NASA's Juno Mission (@NASAJuno) July 5, 2016

Rick Nybakken, a Juno project manager from NASA's Jet Propulsion Laboratory in Pasadena, California, said Monday night's engineering feat went "perfectly."

"Jupiter orbit insertion was a big step and the most challenging remaining in our mission plan, but there are others that have to occur before we can give the science team the mission they are looking for," Nybakken said in a statement.

Over the next 20 months, Juno will circle the planet 37 times, coming as close as 3,100 miles to Jupiter's cloud tops. In that time, scientists hope the data Juno sends back to Earth will help them piece together the puzzle of Jupiter's origin and evolution.

"With its suite of nine science instruments, Juno will investigate the existence of a solid planetary core, map Jupiter's intense magnetic field, measure the amount of water and ammonia in the deep atmosphere and observe the planet's auroras," a NASA blog post said.

The 4-ton Juno launched on Aug. 5, 2011, and is equipped with three 30-foot-long solar arrays, with 18,696 solar cells, which powered it during the trip to Jupiter and will continue to provide energy during the science mission.

The spacecraft conducted a 35-minute burn of its main engine Monday, essentially hitting the brakes and slowing Juno by about 1,200 mph so it could enter a polar orbit around Jupiter. After the successful insertion, Juno turned so its solar cells could once again capture the sun's energy, allowing it to begin the next phase of its mission.

The probe gets its name from the Roman goddess Juno, who was the wife of Jupiter was able to see through clouds.
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After a 1.7 billion mile journey to Jupiter, the Juno space probe's work is only just beginning.
Twitter #occupywallstreet movement aims to mimic Iran
This past spring and summer saw a massive groundswell of populist demonstration against authoritarian regimes in North Africa and the Middle East -- the "Arab Spring" of 2011.

In Tunisia, Egypt, Libya, Bahrain and Syria, protestors took the streets and occupied public spaces in protest of stagnant economies, lack of freedom of expression, and regimes which seemed more concerned with consolidating power than addressing the needs of their people.

Each of these revolutions began in a different way, but they all shared a single common denominator: They were organized and fueled by tech-savvy users of social media, particularly Facebook and Twitter. Is the U.S. ripe for protests akin to those of the Arab Spring?

"There's a very visceral anger against the financial community," Lasn said. "Many people feel that these people who are financial fraudsters, who basically got away with it, have yet to be brought to justice ... . It seems like 'We the People' now have to congregate on Wall Street and other financial districts around the world, and force the global economic system to move in a better, more just direction."

Adbuster's protest campaign began in July, with the launch of a simple campaign website calling for a march through the streets of Lower Manhattan, culminating with a sit-in at the New York Stock Exchange, just as demonstrators in Tunisia occupied Tunis' November 7 Square, or as Egyptians did in Cairo's Tahrir Square.

After a full-court-press on social media websites in mid-Summer, the campaign got a sizable boost in August from the infamous hacktivist group 'Anonymous,' which released a short video urging its supporters to participate in the sit-in.

Since then, the movement has seen the addition of planned protests in other countries, including Japan, Israel, Canada and a half-dozen European nations.
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It worked in Tahrir Square. Now, taking their cue from social-media fueled uprisings in places like Egypt and Iran, a band of online activists are hoping it will work on Wall Street.Kalle Lasn,
Marijuana May be Less Harmful Than Alcohol, Tobacco
The report, published in Scientific Reports at the end of January, compared the potential of death from the typical, recreational use of 10 drugs: marijuana, alcohol, tobacco, heroin, cocaine, ecstasy, methamphetamine, diazepam, amphetamine and methadone. Marijuana was, by far, found to be the safest, even when compared to alcohol and cigarettes.

The new study comes as more Americans push for the right to smoke weed legally.

Lead author Dirk Lachenmeier told NBC News the findings, "confirm earlier results of other study groups [but] with completely different methodology." And while his results may not be surprising, "the absolute differences in riskiness between substances" was even higher than expected.

Alaska has joined two other states in legalizing recreational marijuana. An additional 23 states allow for medical marijuana prescriptions and use. Oregon passed a legalization initiative that will go into effect in July. A law to legalize marijuana in the Washington D.C., approved by voters last fall, will go into effect at 12:01 am on Thursday, unless Congress steps in last minute.

The U.S. Drug Enforcement Administration ranks controlled substances according to five "schedules." Marijuana, along with drugs like heroin and LSD, is a Schedule I drug, meaning it is considered to have the highest potential for abuse and be the "most dangerous."

Alaska Becomes Third State to Legalize Marijuana Washington Has More Pot Than It Can Smoke Pot Vending Machines Dispense Weed

Because alcohol and tobacco are legal, they are not controlled substances, and not subject to DEA scheduling.

For years, medical-marijuana proponents and legalization advocates have deployed the battle cry that cannabis is far safer than alcohol. And they've long contended it's hypocritical for a nation to allow massive alcohol marketing and sales while banning marijuana.

Tobacco use is considered the leading preventable cause of death in the U.S. and chronic alcohol use has been linked to everything from heart disease to cancer. According to the CDC, one in 10 deaths among working-age adults can be attributed to excessive alcohol use and alcohol poisonings account for more than 2,000 American deaths every year.

Meanwhile, most experts say there has never been a documented overdose death from marijuana use in someone without an underlying condition.

Read MoreWhy pot gives people the 'munchies'

That is not to say that marijuana use isn't potentially harmful.
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assistant: Recreational pot is less dangerous than both alcohol and tobacco, scientists assert. NBCNews reports.