On business days (not including Saturday) we will ship the same day if you order before 3pm.

On business days (not including Saturday) we will ship the same day if you order before 3pm.
You may return your order up to one month after ordering and will get your money back immediately.
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For a small fee of EUR 2 you can pay 14 days after delivery.
For an additional EUR 9,90 we will ship next day before 12pm if you order before 3pm and in Germany.
You can pay per invoice, debit, prepayment, credit card, PayPal, cash on delivery or cash on site.
In the shopping cart, you can choose gift wrapping for all of your items.
When ordering, you can choose if you want us to attach a message instead of the invoice.
article no. 19506
Without what could you never leave Earth?
If we put the question like that, we’d probably get a lot of different answers ranging from pragmatic (“a rocket”) to very human (“my dog”) to downright silly (“my beloved Star Trek DVD collection”). But from a physicist’s perspective, there’s only one right answer: escape velocity.
Escape velocity is the minimum speed needed for a free, non-propelled object to escape with a single impulse from the gravitational influence of a massive body, e.g. a planet, starting from the surface of said planet.
To put it more simply, it’s how fast e.g. a rocket would have to be in order to leave the Earth. You can find the physics formula on the Escape Velocity Mug. Here, G is the universal gravitational constant, M the mass of the body to be escaped from, and r the distance from the centre of mass of the body to the object.
For Earth, this velocity is almost 8 km per second!