SpaceJibe

August 25, 2010

New solar system has up to seven planets

Filed under: Cool, Cosmology, Exoplanets, Extraterrestrial Life, Space Exploration — bferrari @ 1:35 pm
Astronomers say the new solar system could hold up to seven Neptune-sized planets. Picture: NASA

Astronomers say the new solar system could hold up to seven Neptune-sized planets. Picture: NASA

A TEAM of astronomers in Chile have announced they have discovered a new solar system that has between five and seven planets, making it the largest known star system outside our own.

Scientists at the European Southern Observatory made the discovery while studying a star located 127 light years away in the constellation of Hydrus.

So far, they have confirmed the existence of five planets in the newly-found solar system, but believe there may be two more.

If that is correct, that star system will have seven planets.

In another similarity to our solar system – which has eight planets – the team said the distances between the planets follow a regular pattern.

The five confirmed planets are fairly large, about the size of Neptune, but travel in an orbit that is closer to their sun.

The possible sixth planet is also huge, roughly the same size as Saturn.

The potential seventh planet is small, about 1.4 times the size of Earth.

It took scientists at the observatory in La Silla, Chile six years to identify all of the planets using the world’s most powerful spectograph, an instrument that allows them to observe light signatures emanating from distant stars.

By analysing how the light that reaches Earth moves, they are able to determine the mass of planets that are passing before it.

So far astronomers know of 15 systems with at least three planets.

Only one, 55 Cancri, contains five planets.

Source


US military’s top secret X-37B shuttle ‘disappears’ for two weeks, changes orbit

Filed under: Cool, Gadgets, Government Policies, Military, Space Ships — bferrari @ 1:12 pm
The X-37B - amateur skywatchers are enjoying the cat-and-mouse game with the US military's "space weapon" / AP

The X-37B - amateur skywatchers are enjoying the cat-and-mouse game with the US military's "space weapon" / AP

AMATEUR astronomers are enjoying a cat-and-mouse game with the US military in keeping track of its secret space plane, the X-37B.

The X-37B was launched in April amid much publicity, but scant detail about its true use.

Built by Boeing’s Phantom Works division, the X-37B program was originally headed by NASA.

It was later turned over to the Pentagon’s research and development arm and then to a secretive Air Force unit.

Only a very select few in the US military know what it’s for, but observers on Earth believe they’re putting together the puzzle piece by piece.

Several sources claim quote arms control advocates who say it’s clearly the beginning of the “weaponisation of space”.

In May, avid skywatcher Ted Molczan studied the X-37B’s orbit from his home in Toronto and said its behaviour suggested it was testing sensors for a range of new spy satellites.

Since then, the X-37B been arguably the least-secret secret project on the planet, as fellow backyard astronomers joined in the scrutiny, aided by how-to video guides and apps such as the Simple Satellite Tracker.

That is, they did until July 29, when the shuttle disappeared, causing all kinds of consternation and conspiracy theories about its fate.

It took amateur skywatcher Greg Roberts of Cape Town, South Africa, who noticed that it failed to appear as scheduled above his base on August 14, another five days to find it.

When he did, he noticed it was some 30km higher and on a different trajectory, according to calculations from other colleagues in Rome and Oklahoma.

The X-37B’s new track takes it on a six-day orbit of the Earth, as opposed to its original four-day orbit.

Mr Molczan believes this may be another small piece to the puzzle about what role the shuttle may play in US military operations.

“This small change of orbit may have been a test of OTV-1’s manoeuvring system, or a requirement of whatever payload may be aboard, or both,” he said in a release paper about Roberts’ X-37B find.

The shuttle has been in orbit now for 124 days. It uses a solar array once in space for power, which theoretically will allow it to stay airborne for up to 270 days.

But the additional presence of large fuel tanks and a rocket motor allows it to change orbit, as evidenced by the latest sudden change of course.

According to the The Register,  this is a key component of its surveillance-related capabilities, along with the fact it can land in a much more versatile fashion than other shuttles.

Using its “cross-range” wings, it can duck off elsewhere once its entered the Earth’s atmosphere rather than follow its oribital track to a pre-specified landing pad.

This means the X-37B can get up and down from space in one orbit, as its wings allow it to compensate for the slight turn in the Earth and bend it back to its original launch pad.

The Register says that capability would make it difficult to track, as it would only pass over a region once.

Theoretically, it could drop a spy satellite on one run, then pick it up on the next without the satellite having ever been detected.

Other observers claim the X-37B can carry a payload roughly the size of a medium-sized truck bed, or enough to hold a spy satellite.

According to the Pentagon, a second X-37B is under construction, so expect the guessing game to continue for some time about what the US military is really up to in space.

Until now, all that remains known about the X-37B is that is it has at least one trick – the ability to hide from skywatchers for two weeks.

In May, avid skywatcher Ted Molczan studied the X-37B’s orbit from his home in Toronto and said its behaviour suggested it was testing sensors for a range of new spy satellites.

Since then, the X-37B been arguably the least-secret secret project on the planet, as fellow backyard astronomers joined in the scrutiny, aided by how-to video guides and apps such as the Simple Satellite Tracker.

That is, they did until July 29, when the shuttle disappeared, causing all kinds of consternation and conspiracy theories about its fate.

It took amateur skywatcher Greg Roberts of Cape Town, South Africa, who noticed that it failed to appear as scheduled above his base on August 14, another five days to find it.

When he did, he noticed it was some 30km higher and on a different trajectory, according to calculations from other colleagues in Rome and Oklahoma.

The X-37B’s new track takes it on a six-day orbit of the Earth, as opposed to its original four-day orbit.

Mr Molczan believes this may be another small piece to the puzzle about what role the shuttle may play in US military operations.

“This small change of orbit may have been a test of OTV-1’s manoeuvring system, or a requirement of whatever payload may be aboard, or both,” he said in a release paper about Roberts’ X-37B find.

The shuttle has been in orbit now for 124 days. It uses a solar array once in space for power, which theoretically will allow it to stay airborne for up to 270 days.

But the additional presence of large fuel tanks and a rocket motor allows it to change orbit, as evidenced by the latest sudden change of course.

According to the The Register,  this is a key component of its surveillance-related capabilities, along with the fact it can land in a much more versatile fashion than other shuttles.

Using its “cross-range” wings, it can duck off elsewhere once its entered the Earth’s atmosphere rather than follow its oribital track to a pre-specified landing pad.

This means the X-37B can get up and down from space in one orbit, as its wings allow it to compensate for the slight turn in the Earth and bend it back to its original launch pad.

The Register says that capability would make it difficult to track, as it would only pass over a region once.

Theoretically, it could drop a spy satellite on one run, then pick it up on the next without the satellite having ever been detected.

Other observers claim the X-37B can carry a payload roughly the size of a medium-sized truck bed, or enough to hold a spy satellite.

According to the Pentagon, a second X-37B is under construction, so expect the guessing game to continue for some time about what the US military is really up to in space.

Until now, all that remains known about the X-37B is that is it has at least one trick – the ability to hide from skywatchers for two weeks.

Source

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